feat(US2): image quad extraction — POST /api/v1/image/extract

- app/models/image_models.py: BBox, QuadrupleItem, ImageExtract{Request,Response}
- app/services/image_service.py: download → base64 LLM → bbox clamp → crop upload
- app/routers/image.py: POST /image/extract handler
- tests: 4 service + 3 router tests, 7/7 passing
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wh
2026-04-10 15:40:56 +08:00
parent dd8da386f4
commit 2876c179ac
10 changed files with 299 additions and 1 deletions

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