feat: add batch AI re-organize for transfer history and search result recommendation

- Implement batch AI re-organize endpoint for transfer history with progress tracking
- Add batch_manual_transfer_redo system task template and prompt generation
- Refactor agent_manager to support generic background prompt execution
- Add AIRecommendChain for search result recommendation using agent background prompt
- Update search endpoints to use new AIRecommendChain and remove legacy code
- Enhance test cases for batch manual transfer redo
- Minor code cleanup and style fixes

app/agent/tools/impl/transfer_file.py

@@ -6,7 +6,6 @@ from typing import Optional, Type
 from pydantic import BaseModel, Field
 
 from app.agent.tools.base import MoviePilotTool
-from app.chain.transfer import TransferChain
 from app.log import logger
 from app.schemas import FileItem, MediaType
 
@@ -124,6 +123,8 @@ class TransferFileTool(MoviePilotTool):
             if not media_type_enum:
                 return f"错误：无效的媒体类型 '{media_type}'，支持的类型：'movie', 'tv'"
 
+        from app.chain.transfer import TransferChain
+
         state, errormsg = TransferChain().manual_transfer(
             fileitem=fileitem,
             target_storage=target_storage,