diff --git a/.env b/.env
new file mode 100644
index 0000000..20292a0
--- /dev/null
+++ b/.env
@@ -0,0 +1,10 @@
+# Required — fill in before running
+ZHIPUAI_API_KEY=your-zhipuai-api-key-here
+STORAGE_ACCESS_KEY=your-storage-access-key
+STORAGE_SECRET_KEY=your-storage-secret-key
+STORAGE_ENDPOINT=http://rustfs:9000
+
+# Optional overrides
+BACKEND_CALLBACK_URL=http://label-backend:8080/api/ai/callback
+LOG_LEVEL=INFO
+# MAX_VIDEO_SIZE_MB=200
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0f47a07
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,32 @@
+# ==========================================
+# 1. Maven/Java 构建产物 (一键忽略整个目录)
+# ==========================================
+target/
+*.class
+*.jar
+*.war
+*.ear
+
+# ==========================================
+# 2. IDE 配置文件
+# ==========================================
+.idea/
+.vscode/
+*.iml
+*.ipr
+*.iws
+
+# ==========================================
+# 3. 项目特定工具目录 (根据你的文件列表)
+# ==========================================
+# 忽略 Specifiy 工具生成的所有配置和脚本
+.specify/
+
+# 忽略 Claude 本地设置和技能文件
+.claude/
+
+# ==========================================
+# 4. 操作系统文件
+# ==========================================
+.DS_Store
+Thumbs.db
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..c6fdd28
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,18 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libgl1 \
+    libglib2.0-0 \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
diff --git a/app/__init__.py b/app/__init__.py
new file mode 100644
index 0000000..e69de29
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diff --git a/app/clients/__init__.py b/app/clients/__init__.py
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diff --git a/app/clients/llm/__init__.py b/app/clients/llm/__init__.py
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index 0000000..e69de29
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diff --git a/app/clients/llm/__pycache__/base.cpython-312.pyc b/app/clients/llm/__pycache__/base.cpython-312.pyc
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diff --git a/app/clients/llm/__pycache__/zhipuai_client.cpython-312.pyc b/app/clients/llm/__pycache__/zhipuai_client.cpython-312.pyc
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diff --git a/app/clients/llm/base.py b/app/clients/llm/base.py
new file mode 100644
index 0000000..33ab1d8
--- /dev/null
+++ b/app/clients/llm/base.py
@@ -0,0 +1,11 @@
+from abc import ABC, abstractmethod
+
+
+class LLMClient(ABC):
+    @abstractmethod
+    async def chat(self, model: str, messages: list[dict]) -> str:
+        """Send a text chat request and return the response content string."""
+
+    @abstractmethod
+    async def chat_vision(self, model: str, messages: list[dict]) -> str:
+        """Send a multimodal (vision) chat request and return the response content string."""
diff --git a/app/clients/llm/zhipuai_client.py b/app/clients/llm/zhipuai_client.py
new file mode 100644
index 0000000..a92322d
--- /dev/null
+++ b/app/clients/llm/zhipuai_client.py
@@ -0,0 +1,37 @@
+import asyncio
+
+from zhipuai import ZhipuAI
+
+from app.clients.llm.base import LLMClient
+from app.core.exceptions import LLMCallError
+from app.core.logging import get_logger
+
+logger = get_logger(__name__)
+
+
+class ZhipuAIClient(LLMClient):
+    def __init__(self, api_key: str) -> None:
+        self._client = ZhipuAI(api_key=api_key)
+
+    async def chat(self, model: str, messages: list[dict]) -> str:
+        return await self._call(model, messages)
+
+    async def chat_vision(self, model: str, messages: list[dict]) -> str:
+        return await self._call(model, messages)
+
+    async def _call(self, model: str, messages: list[dict]) -> str:
+        loop = asyncio.get_event_loop()
+        try:
+            response = await loop.run_in_executor(
+                None,
+                lambda: self._client.chat.completions.create(
+                    model=model,
+                    messages=messages,
+                ),
+            )
+            content = response.choices[0].message.content
+            logger.info("llm_call", extra={"model": model, "response_len": len(content)})
+            return content
+        except Exception as exc:
+            logger.error("llm_call_error", extra={"model": model, "error": str(exc)})
+            raise LLMCallError(f"大模型调用失败: {exc}") from exc
diff --git a/app/clients/storage/__init__.py b/app/clients/storage/__init__.py
new file mode 100644
index 0000000..e69de29
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diff --git a/app/clients/storage/__pycache__/rustfs_client.cpython-312.pyc b/app/clients/storage/__pycache__/rustfs_client.cpython-312.pyc
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diff --git a/app/clients/storage/base.py b/app/clients/storage/base.py
new file mode 100644
index 0000000..89535a4
--- /dev/null
+++ b/app/clients/storage/base.py
@@ -0,0 +1,21 @@
+from abc import ABC, abstractmethod
+
+
+class StorageClient(ABC):
+    @abstractmethod
+    async def download_bytes(self, bucket: str, path: str) -> bytes:
+        """Download an object and return its raw bytes."""
+
+    @abstractmethod
+    async def upload_bytes(
+        self, bucket: str, path: str, data: bytes, content_type: str = "application/octet-stream"
+    ) -> None:
+        """Upload raw bytes to the given bucket/path."""
+
+    @abstractmethod
+    async def get_presigned_url(self, bucket: str, path: str, expires: int = 3600) -> str:
+        """Return a presigned GET URL valid for `expires` seconds."""
+
+    @abstractmethod
+    async def get_object_size(self, bucket: str, path: str) -> int:
+        """Return the object size in bytes without downloading it."""
diff --git a/app/clients/storage/rustfs_client.py b/app/clients/storage/rustfs_client.py
new file mode 100644
index 0000000..8ef105a
--- /dev/null
+++ b/app/clients/storage/rustfs_client.py
@@ -0,0 +1,70 @@
+import asyncio
+import io
+
+import boto3
+from botocore.exceptions import ClientError
+
+from app.clients.storage.base import StorageClient
+from app.core.exceptions import StorageError
+from app.core.logging import get_logger
+
+logger = get_logger(__name__)
+
+
+class RustFSClient(StorageClient):
+    def __init__(self, endpoint: str, access_key: str, secret_key: str) -> None:
+        self._s3 = boto3.client(
+            "s3",
+            endpoint_url=endpoint,
+            aws_access_key_id=access_key,
+            aws_secret_access_key=secret_key,
+        )
+
+    async def download_bytes(self, bucket: str, path: str) -> bytes:
+        loop = asyncio.get_event_loop()
+        try:
+            resp = await loop.run_in_executor(
+                None, lambda: self._s3.get_object(Bucket=bucket, Key=path)
+            )
+            return resp["Body"].read()
+        except ClientError as exc:
+            raise StorageError(f"存储下载失败 [{bucket}/{path}]: {exc}") from exc
+
+    async def upload_bytes(
+        self, bucket: str, path: str, data: bytes, content_type: str = "application/octet-stream"
+    ) -> None:
+        loop = asyncio.get_event_loop()
+        try:
+            await loop.run_in_executor(
+                None,
+                lambda: self._s3.put_object(
+                    Bucket=bucket, Key=path, Body=io.BytesIO(data), ContentType=content_type
+                ),
+            )
+        except ClientError as exc:
+            raise StorageError(f"存储上传失败 [{bucket}/{path}]: {exc}") from exc
+
+    async def get_presigned_url(self, bucket: str, path: str, expires: int = 3600) -> str:
+        loop = asyncio.get_event_loop()
+        try:
+            url = await loop.run_in_executor(
+                None,
+                lambda: self._s3.generate_presigned_url(
+                    "get_object",
+                    Params={"Bucket": bucket, "Key": path},
+                    ExpiresIn=expires,
+                ),
+            )
+            return url
+        except ClientError as exc:
+            raise StorageError(f"生成预签名 URL 失败 [{bucket}/{path}]: {exc}") from exc
+
+    async def get_object_size(self, bucket: str, path: str) -> int:
+        loop = asyncio.get_event_loop()
+        try:
+            resp = await loop.run_in_executor(
+                None, lambda: self._s3.head_object(Bucket=bucket, Key=path)
+            )
+            return resp["ContentLength"]
+        except ClientError as exc:
+            raise StorageError(f"获取文件大小失败 [{bucket}/{path}]: {exc}") from exc
diff --git a/app/core/__init__.py b/app/core/__init__.py
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diff --git a/app/core/config.py b/app/core/config.py
new file mode 100644
index 0000000..ac40a1d
--- /dev/null
+++ b/app/core/config.py
@@ -0,0 +1,46 @@
+import os
+from functools import lru_cache
+from pathlib import Path
+from typing import Any
+
+import yaml
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# Maps environment variable names to nested YAML key paths
+_ENV_OVERRIDES: dict[str, list[str]] = {
+    "ZHIPUAI_API_KEY": ["zhipuai", "api_key"],
+    "STORAGE_ACCESS_KEY": ["storage", "access_key"],
+    "STORAGE_SECRET_KEY": ["storage", "secret_key"],
+    "STORAGE_ENDPOINT": ["storage", "endpoint"],
+    "BACKEND_CALLBACK_URL": ["backend", "callback_url"],
+    "LOG_LEVEL": ["server", "log_level"],
+    "MAX_VIDEO_SIZE_MB": ["video", "max_file_size_mb"],
+}
+
+_CONFIG_PATH = Path(__file__).parent.parent.parent / "config.yaml"
+
+
+def _set_nested(cfg: dict, keys: list[str], value: Any) -> None:
+    for key in keys[:-1]:
+        cfg = cfg.setdefault(key, {})
+    # Coerce numeric env vars
+    try:
+        value = int(value)
+    except (TypeError, ValueError):
+        pass
+    cfg[keys[-1]] = value
+
+
+@lru_cache(maxsize=1)
+def get_config() -> dict:
+    with open(_CONFIG_PATH, "r", encoding="utf-8") as f:
+        cfg: dict = yaml.safe_load(f)
+
+    for env_var, key_path in _ENV_OVERRIDES.items():
+        value = os.environ.get(env_var)
+        if value is not None:
+            _set_nested(cfg, key_path, value)
+
+    return cfg
diff --git a/app/core/dependencies.py b/app/core/dependencies.py
new file mode 100644
index 0000000..66a9c72
--- /dev/null
+++ b/app/core/dependencies.py
@@ -0,0 +1,23 @@
+from functools import lru_cache
+
+from app.clients.llm.base import LLMClient
+from app.clients.llm.zhipuai_client import ZhipuAIClient
+from app.clients.storage.base import StorageClient
+from app.clients.storage.rustfs_client import RustFSClient
+from app.core.config import get_config
+
+
+@lru_cache(maxsize=1)
+def get_llm_client() -> LLMClient:
+    cfg = get_config()
+    return ZhipuAIClient(api_key=cfg["zhipuai"]["api_key"])
+
+
+@lru_cache(maxsize=1)
+def get_storage_client() -> StorageClient:
+    cfg = get_config()
+    return RustFSClient(
+        endpoint=cfg["storage"]["endpoint"],
+        access_key=cfg["storage"]["access_key"],
+        secret_key=cfg["storage"]["secret_key"],
+    )
diff --git a/app/core/exceptions.py b/app/core/exceptions.py
new file mode 100644
index 0000000..aa7fd15
--- /dev/null
+++ b/app/core/exceptions.py
@@ -0,0 +1,50 @@
+from fastapi import Request
+from fastapi.responses import JSONResponse
+
+
+class AIServiceError(Exception):
+    status_code: int = 500
+    code: str = "INTERNAL_ERROR"
+
+    def __init__(self, message: str) -> None:
+        self.message = message
+        super().__init__(message)
+
+
+class UnsupportedFileTypeError(AIServiceError):
+    status_code = 400
+    code = "UNSUPPORTED_FILE_TYPE"
+
+
+class VideoTooLargeError(AIServiceError):
+    status_code = 400
+    code = "VIDEO_TOO_LARGE"
+
+
+class StorageError(AIServiceError):
+    status_code = 502
+    code = "STORAGE_ERROR"
+
+
+class LLMParseError(AIServiceError):
+    status_code = 502
+    code = "LLM_PARSE_ERROR"
+
+
+class LLMCallError(AIServiceError):
+    status_code = 503
+    code = "LLM_CALL_ERROR"
+
+
+async def ai_service_exception_handler(request: Request, exc: AIServiceError) -> JSONResponse:
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={"code": exc.code, "message": exc.message},
+    )
+
+
+async def unhandled_exception_handler(request: Request, exc: Exception) -> JSONResponse:
+    return JSONResponse(
+        status_code=500,
+        content={"code": "INTERNAL_ERROR", "message": str(exc)},
+    )
diff --git a/app/core/json_utils.py b/app/core/json_utils.py
new file mode 100644
index 0000000..494b5fb
--- /dev/null
+++ b/app/core/json_utils.py
@@ -0,0 +1,19 @@
+import json
+import re
+
+from app.core.exceptions import LLMParseError
+
+
+def extract_json(text: str) -> any:
+    """Parse JSON from LLM response, stripping Markdown code fences if present."""
+    text = text.strip()
+
+    # Strip ```json ... ``` or ``` ... ``` fences
+    fence_match = re.search(r"```(?:json)?\s*([\s\S]+?)\s*```", text)
+    if fence_match:
+        text = fence_match.group(1).strip()
+
+    try:
+        return json.loads(text)
+    except json.JSONDecodeError as e:
+        raise LLMParseError(f"大模型返回非合法 JSON: {e}") from e
diff --git a/app/core/logging.py b/app/core/logging.py
new file mode 100644
index 0000000..1fd8b9d
--- /dev/null
+++ b/app/core/logging.py
@@ -0,0 +1,62 @@
+import json
+import logging
+import time
+from typing import Callable
+
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+from starlette.responses import Response
+
+
+def get_logger(name: str) -> logging.Logger:
+    logger = logging.getLogger(name)
+    if not logger.handlers:
+        handler = logging.StreamHandler()
+        handler.setFormatter(_JsonFormatter())
+        logger.addHandler(handler)
+        logger.propagate = False
+    return logger
+
+
+class _JsonFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        payload = {
+            "time": self.formatTime(record, datefmt="%Y-%m-%dT%H:%M:%S"),
+            "level": record.levelname,
+            "logger": record.name,
+            "message": record.getMessage(),
+        }
+        if record.exc_info:
+            payload["exc_info"] = self.formatException(record.exc_info)
+        # Merge any extra fields passed via `extra=`
+        for key, value in record.__dict__.items():
+            if key not in (
+                "name", "msg", "args", "levelname", "levelno", "pathname",
+                "filename", "module", "exc_info", "exc_text", "stack_info",
+                "lineno", "funcName", "created", "msecs", "relativeCreated",
+                "thread", "threadName", "processName", "process", "message",
+                "taskName",
+            ):
+                payload[key] = value
+        return json.dumps(payload, ensure_ascii=False)
+
+
+class RequestLoggingMiddleware(BaseHTTPMiddleware):
+    def __init__(self, app, logger: logging.Logger | None = None) -> None:
+        super().__init__(app)
+        self._logger = logger or get_logger("request")
+
+    async def dispatch(self, request: Request, call_next: Callable) -> Response:
+        start = time.perf_counter()
+        response = await call_next(request)
+        duration_ms = round((time.perf_counter() - start) * 1000, 1)
+        self._logger.info(
+            "request",
+            extra={
+                "method": request.method,
+                "path": request.url.path,
+                "status": response.status_code,
+                "duration_ms": duration_ms,
+            },
+        )
+        return response
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..1ee4df0
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,46 @@
+from contextlib import asynccontextmanager
+
+from fastapi import FastAPI
+
+from app.core.exceptions import (
+    AIServiceError,
+    ai_service_exception_handler,
+    unhandled_exception_handler,
+)
+from app.core.logging import RequestLoggingMiddleware, get_logger
+
+logger = get_logger(__name__)
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    logger.info("startup", extra={"message": "AI service starting"})
+    yield
+    logger.info("shutdown", extra={"message": "AI service stopping"})
+
+
+app = FastAPI(
+    title="Label AI Service",
+    description="知识图谱标注平台 AI 计算服务",
+    version="1.0.0",
+    lifespan=lifespan,
+)
+
+app.add_middleware(RequestLoggingMiddleware)
+app.add_exception_handler(AIServiceError, ai_service_exception_handler)
+app.add_exception_handler(Exception, unhandled_exception_handler)
+
+
+@app.get("/health", tags=["Health"])
+async def health():
+    return {"status": "ok"}
+
+
+# Routers registered after implementation (imported lazily to avoid circular deps)
+from app.routers import text, image, video, qa, finetune  # noqa: E402
+
+app.include_router(text.router, prefix="/api/v1")
+app.include_router(image.router, prefix="/api/v1")
+app.include_router(video.router, prefix="/api/v1")
+app.include_router(qa.router, prefix="/api/v1")
+app.include_router(finetune.router, prefix="/api/v1")
diff --git a/app/models/__init__.py b/app/models/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/routers/__init__.py b/app/routers/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/app/routers/finetune.py b/app/routers/finetune.py
new file mode 100644
index 0000000..f16ec0f
--- /dev/null
+++ b/app/routers/finetune.py
@@ -0,0 +1,3 @@
+from fastapi import APIRouter
+
+router = APIRouter(tags=["Finetune"])
diff --git a/app/routers/image.py b/app/routers/image.py
new file mode 100644
index 0000000..30aefbc
--- /dev/null
+++ b/app/routers/image.py
@@ -0,0 +1,3 @@
+from fastapi import APIRouter
+
+router = APIRouter(tags=["Image"])
diff --git a/app/routers/qa.py b/app/routers/qa.py
new file mode 100644
index 0000000..5b22c10
--- /dev/null
+++ b/app/routers/qa.py
@@ -0,0 +1,3 @@
+from fastapi import APIRouter
+
+router = APIRouter(tags=["QA"])
diff --git a/app/routers/text.py b/app/routers/text.py
new file mode 100644
index 0000000..44c49f9
--- /dev/null
+++ b/app/routers/text.py
@@ -0,0 +1,3 @@
+from fastapi import APIRouter
+
+router = APIRouter(tags=["Text"])
diff --git a/app/routers/video.py b/app/routers/video.py
new file mode 100644
index 0000000..136e997
--- /dev/null
+++ b/app/routers/video.py
@@ -0,0 +1,3 @@
+from fastapi import APIRouter
+
+router = APIRouter(tags=["Video"])
diff --git a/app/services/__init__.py b/app/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/config.yaml b/config.yaml
new file mode 100644
index 0000000..2e68628
--- /dev/null
+++ b/config.yaml
@@ -0,0 +1,19 @@
+server:
+  port: 8000
+  log_level: INFO
+
+storage:
+  buckets:
+    source_data: "source-data"
+    finetune_export: "finetune-export"
+
+backend: {}   # callback_url injected via BACKEND_CALLBACK_URL env var
+
+video:
+  frame_sample_count: 8    # uniform frames sampled for video-to-text
+  max_file_size_mb: 200    # video size limit (override with MAX_VIDEO_SIZE_MB)
+  keyframe_diff_threshold: 30.0  # grayscale mean-diff threshold for keyframe detection
+
+models:
+  default_text: "glm-4-flash"
+  default_vision: "glm-4v-flash"
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..fa5fa65
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,37 @@
+version: "3.9"
+
+services:
+  ai-service:
+    build: .
+    ports:
+      - "8000:8000"
+    env_file:
+      - .env
+    depends_on:
+      rustfs:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
+
+  rustfs:
+    image: rustfs/rustfs:latest
+    ports:
+      - "9000:9000"
+    environment:
+      RUSTFS_ACCESS_KEY: ${STORAGE_ACCESS_KEY}
+      RUSTFS_SECRET_KEY: ${STORAGE_SECRET_KEY}
+    volumes:
+      - rustfs_data:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/health"]
+      interval: 10s
+      timeout: 3s
+      retries: 5
+      start_period: 5s
+
+volumes:
+  rustfs_data:
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..78c5011
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,3 @@
+[pytest]
+asyncio_mode = auto
+testpaths = tests
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..9e74516
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,16 @@
+fastapi>=0.111.0
+uvicorn[standard]>=0.29.0
+pydantic>=2.7.0
+zhipuai>=2.1.0
+boto3>=1.34.0
+pdfplumber>=0.11.0
+python-docx>=1.1.0
+opencv-python-headless>=4.9.0
+numpy>=1.26.0
+httpx>=0.27.0
+python-dotenv>=1.0.0
+pyyaml>=6.0.0
+
+# Testing
+pytest>=8.0.0
+pytest-asyncio>=0.23.0
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/__pycache__/__init__.cpython-312.pyc b/tests/__pycache__/__init__.cpython-312.pyc
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index 0000000..3cb3690
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diff --git a/tests/__pycache__/test_llm_client.cpython-312-pytest-9.0.3.pyc b/tests/__pycache__/test_llm_client.cpython-312-pytest-9.0.3.pyc
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diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..ae81f4d
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,39 @@
+import pytest
+from unittest.mock import AsyncMock, MagicMock
+from fastapi.testclient import TestClient
+
+from app.clients.llm.base import LLMClient
+from app.clients.storage.base import StorageClient
+from app.core.dependencies import get_llm_client, get_storage_client
+
+
+@pytest.fixture
+def mock_llm() -> LLMClient:
+    client = MagicMock(spec=LLMClient)
+    client.chat = AsyncMock(return_value='[]')
+    client.chat_vision = AsyncMock(return_value='[]')
+    return client
+
+
+@pytest.fixture
+def mock_storage() -> StorageClient:
+    client = MagicMock(spec=StorageClient)
+    client.download_bytes = AsyncMock(return_value=b"")
+    client.upload_bytes = AsyncMock(return_value=None)
+    client.get_presigned_url = AsyncMock(return_value="http://example.com/presigned")
+    client.get_object_size = AsyncMock(return_value=10 * 1024 * 1024)  # 10 MB default
+    return client
+
+
+@pytest.fixture
+def test_app(mock_llm, mock_storage):
+    from app.main import app
+    app.dependency_overrides[get_llm_client] = lambda: mock_llm
+    app.dependency_overrides[get_storage_client] = lambda: mock_storage
+    yield app
+    app.dependency_overrides.clear()
+
+
+@pytest.fixture
+def client(test_app):
+    return TestClient(test_app)
diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..aa8f464
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,40 @@
+import os
+import pytest
+
+
+def test_yaml_defaults_load(monkeypatch):
+    # Clear lru_cache so each test gets a fresh load
+    from app.core import config as cfg_module
+    cfg_module.get_config.cache_clear()
+
+    # Remove env overrides that might bleed from shell environment
+    for var in ["MAX_VIDEO_SIZE_MB", "LOG_LEVEL", "STORAGE_ENDPOINT"]:
+        monkeypatch.delenv(var, raising=False)
+
+    cfg = cfg_module.get_config()
+
+    assert cfg["server"]["port"] == 8000
+    assert cfg["video"]["max_file_size_mb"] == 200
+    assert cfg["models"]["default_text"] == "glm-4-flash"
+    assert cfg["models"]["default_vision"] == "glm-4v-flash"
+    assert cfg["storage"]["buckets"]["source_data"] == "source-data"
+
+
+def test_max_video_size_env_override(monkeypatch):
+    from app.core import config as cfg_module
+    cfg_module.get_config.cache_clear()
+
+    monkeypatch.setenv("MAX_VIDEO_SIZE_MB", "500")
+    cfg = cfg_module.get_config()
+
+    assert cfg["video"]["max_file_size_mb"] == 500
+
+
+def test_log_level_env_override(monkeypatch):
+    from app.core import config as cfg_module
+    cfg_module.get_config.cache_clear()
+
+    monkeypatch.setenv("LOG_LEVEL", "DEBUG")
+    cfg = cfg_module.get_config()
+
+    assert cfg["server"]["log_level"] == "DEBUG"
diff --git a/tests/test_llm_client.py b/tests/test_llm_client.py
new file mode 100644
index 0000000..39a586b
--- /dev/null
+++ b/tests/test_llm_client.py
@@ -0,0 +1,40 @@
+import pytest
+from unittest.mock import MagicMock, patch
+
+from app.clients.llm.zhipuai_client import ZhipuAIClient
+from app.core.exceptions import LLMCallError
+
+
+@pytest.fixture
+def mock_sdk_response():
+    resp = MagicMock()
+    resp.choices[0].message.content = '{"result": "ok"}'
+    return resp
+
+
+@pytest.fixture
+def client():
+    with patch("app.clients.llm.zhipuai_client.ZhipuAI"):
+        c = ZhipuAIClient(api_key="test-key")
+        return c
+
+
+@pytest.mark.asyncio
+async def test_chat_returns_content(client, mock_sdk_response):
+    client._client.chat.completions.create.return_value = mock_sdk_response
+    result = await client.chat("glm-4-flash", [{"role": "user", "content": "hello"}])
+    assert result == '{"result": "ok"}'
+
+
+@pytest.mark.asyncio
+async def test_chat_vision_returns_content(client, mock_sdk_response):
+    client._client.chat.completions.create.return_value = mock_sdk_response
+    result = await client.chat_vision("glm-4v-flash", [{"role": "user", "content": []}])
+    assert result == '{"result": "ok"}'
+
+
+@pytest.mark.asyncio
+async def test_llm_call_error_on_sdk_exception(client):
+    client._client.chat.completions.create.side_effect = RuntimeError("quota exceeded")
+    with pytest.raises(LLMCallError, match="大模型调用失败"):
+        await client.chat("glm-4-flash", [{"role": "user", "content": "hi"}])
diff --git a/tests/test_storage_client.py b/tests/test_storage_client.py
new file mode 100644
index 0000000..d124563
--- /dev/null
+++ b/tests/test_storage_client.py
@@ -0,0 +1,62 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from botocore.exceptions import ClientError
+
+from app.clients.storage.rustfs_client import RustFSClient
+from app.core.exceptions import StorageError
+
+
+@pytest.fixture
+def client():
+    with patch("app.clients.storage.rustfs_client.boto3") as mock_boto3:
+        c = RustFSClient(
+            endpoint="http://rustfs:9000",
+            access_key="key",
+            secret_key="secret",
+        )
+        c._s3 = MagicMock()
+        return c
+
+
+@pytest.mark.asyncio
+async def test_download_bytes_returns_bytes(client):
+    client._s3.get_object.return_value = {"Body": MagicMock(read=lambda: b"hello")}
+    result = await client.download_bytes("source-data", "text/test.txt")
+    assert result == b"hello"
+    client._s3.get_object.assert_called_once_with(Bucket="source-data", Key="text/test.txt")
+
+
+@pytest.mark.asyncio
+async def test_download_bytes_raises_storage_error(client):
+    client._s3.get_object.side_effect = ClientError(
+        {"Error": {"Code": "NoSuchKey", "Message": "Not Found"}}, "GetObject"
+    )
+    with pytest.raises(StorageError, match="存储下载失败"):
+        await client.download_bytes("source-data", "missing.txt")
+
+
+@pytest.mark.asyncio
+async def test_get_object_size_returns_content_length(client):
+    client._s3.head_object.return_value = {"ContentLength": 1024}
+    size = await client.get_object_size("source-data", "video/test.mp4")
+    assert size == 1024
+    client._s3.head_object.assert_called_once_with(Bucket="source-data", Key="video/test.mp4")
+
+
+@pytest.mark.asyncio
+async def test_get_object_size_raises_storage_error(client):
+    client._s3.head_object.side_effect = ClientError(
+        {"Error": {"Code": "NoSuchKey", "Message": "Not Found"}}, "HeadObject"
+    )
+    with pytest.raises(StorageError, match="获取文件大小失败"):
+        await client.get_object_size("source-data", "video/missing.mp4")
+
+
+@pytest.mark.asyncio
+async def test_upload_bytes_calls_put_object(client):
+    client._s3.put_object.return_value = {}
+    await client.upload_bytes("source-data", "frames/1/0.jpg", b"jpeg-data", "image/jpeg")
+    client._s3.put_object.assert_called_once()
+    call_kwargs = client._s3.put_object.call_args
+    assert call_kwargs.kwargs["Bucket"] == "source-data"
+    assert call_kwargs.kwargs["Key"] == "frames/1/0.jpg"