Update spec files to match current implementation state

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

FitnessSync/QWEN.md

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+# FitTrack2 Development Guidelines
+
+Auto-generated from all feature plans. Last updated: 2025-12-25
+
+## Active Technologies
+
+- (001-fitbit-garmin-sync)
+
+## Project Structure
+
+```text
+backend/
+├── alembic/
+├── src/
+│   ├── models/
+│   ├── services/
+│   ├── api/
+│   └── utils/
+├── templates/
+├── static/
+├── main.py
+├── requirements.txt
+└── Dockerfile
+frontend/
+tests/
+└── integration/
+    └── test_sync_flow.py
+```
+
+## Commands
+
+```bash
+# Run the application
+docker-compose up --build
+
+# Run tests
+python -m pytest tests/
+
+# Run migrations
+alembic upgrade head
+```
+
+## Code Style
+
+: Follow standard conventions
+
+## Recent Changes
+
+- 001-fitbit-garmin-sync: Added complete implementation for Fitbit-Garmin synchronization, including weight sync, activity archiving, and health metrics download
+
+<!-- MANUAL ADDITIONS START -->
+<!-- MANUAL ADDITIONS END -->