feat: initial project setup

- Add .NET 8 backend with Clean Architecture
- Add React + Vite + TypeScript frontend
- Implement authentication with JWT
- Implement Azure Blob Storage client
- Implement OCR integration
- Implement supplier matching service
- Implement voucher generation
- Implement Fortnox provider
- Add unit and integration tests
- Add Docker Compose configuration

.claude/CLAUDE.md

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+# Invoice Master POC v2
+
+Swedish Invoice Field Extraction System - YOLOv11 + PaddleOCR 从瑞典 PDF 发票中提取结构化数据。
+
+## Tech Stack
+
+| Component | Technology |
+|-----------|------------|
+| Object Detection | YOLOv11 (Ultralytics) |
+| OCR Engine | PaddleOCR v5 (PP-OCRv5) |
+| PDF Processing | PyMuPDF (fitz) |
+| Database | PostgreSQL + psycopg2 |
+| Web Framework | FastAPI + Uvicorn |
+| Deep Learning | PyTorch + CUDA 12.x |
+
+## WSL Environment (REQUIRED)
+
+**Prefix ALL commands with:**
+
+```bash
+wsl bash -c "source ~/miniconda3/etc/profile.d/conda.sh && conda activate invoice-py311 && <command>"
+```
+
+**NEVER run Python commands directly in Windows PowerShell/CMD.**
+
+## Project-Specific Rules
+
+- Python 3.11+ with type hints
+- No print() in production - use logging
+- Run tests: `pytest --cov=src`
+
+## Critical Rules
+
+### Code Organization
+
+- Many small files over few large files
+- High cohesion, low coupling
+- 200-400 lines typical, 800 max per file
+- Organize by feature/domain, not by type
+
+### Code Style
+
+- No emojis in code, comments, or documentation
+- Immutability always - never mutate objects or arrays
+- No console.log in production code
+- Proper error handling with try/catch
+- Input validation with Zod or similar
+
+### Testing
+
+- TDD: Write tests first
+- 80% minimum coverage
+- Unit tests for utilities
+- Integration tests for APIs
+- E2E tests for critical flows
+
+### Security
+
+- No hardcoded secrets
+- Environment variables for sensitive data
+- Validate all user inputs
+- Parameterized queries only
+- CSRF protection enabled
+
+## Environment Variables
+
+```bash
+# Required
+DB_PASSWORD=
+
+# Optional (with defaults)
+DB_HOST=192.168.68.31
+DB_PORT=5432
+DB_NAME=docmaster
+DB_USER=docmaster
+MODEL_PATH=runs/train/invoice_fields/weights/best.pt
+CONFIDENCE_THRESHOLD=0.5
+SERVER_HOST=0.0.0.0
+SERVER_PORT=8000
+```
+## Available Commands
+
+- `/tdd` - Test-driven development workflow
+- `/plan` - Create implementation plan
+- `/code-review` - Review code quality
+- `/build-fix` - Fix build errors
+
+## Git Workflow
+
+- Conventional commits: `feat:`, `fix:`, `refactor:`, `docs:`, `test:`
+- Never commit to main directly
+- PRs require review
+- All tests must pass before merge