Follows architecture rule: Pydantic schemas belong in models/schema/
- Moved LetzshopExportRequest to models/schema/vendor.py
- Added LetzshopExportFileInfo and LetzshopExportResponse schemas
- Updated API endpoint to use proper response_model
- Removed inline BaseModel import from API file
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>