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feat(api): implement local training MVP with adapter pattern
liumaolin
- Add adapter base classes (TaskQueue, Progress, Storage, Database)
- Implement local adapters (AsyncTrainingManager, SQLite, LocalStorage)
- Add Pydantic schemas for tasks, experiments, files, and stages
- Implement service layer (TaskService, ExperimentService, FileService)
- Add API endpoints for Quick Mode (/tasks) and Advanced Mode (/experiments)
- Add adapter factory with dependency injection support
- Update architecture design document with implementation status
