0880e1018c
- Add submit_finetune and get_finetune_status abstract methods to LLMClient base - Implement both methods in ZhipuAIClient using asyncio.get_running_loop() - Rewrite finetune_service to call llm.submit_finetune / llm.get_finetune_status instead of accessing llm._client directly, restoring interface encapsulation - Replace asyncio.get_event_loop() with get_running_loop() in ZhipuAIClient._call and all four methods in RustFSClient (deprecated in Python 3.10+) - Update test_finetune_service to mock the LLMClient interface methods as AsyncMocks - Add two new tests in test_llm_client for submit_finetune and get_finetune_status
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