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

backend/.env.example

@@ -0,0 +1,106 @@
+# Backend Environment Variables
+# Copy this file to .env and fill in your values
+
+# ==========================================
+# Application Configuration
+# ==========================================
+APP_NAME=Fortnox Invoice Integration
+APP_ENV=development
+DEBUG=true
+SECRET_KEY=change-this-to-a-random-secret-key-in-production
+
+# ==========================================
+# Server Configuration
+# ==========================================
+HOST=0.0.0.0
+PORT=8000
+
+# ==========================================
+# Database Configuration
+# ==========================================
+# Format: postgresql://user:password@host:port/database
+DATABASE_URL=postgresql://postgres:postgres@localhost:5432/fortnox_invoice
+# For async SQLAlchemy
+ASYNC_DATABASE_URL=postgresql+asyncpg://postgres:postgres@localhost:5432/fortnox_invoice
+
+# Database pool settings
+DB_POOL_SIZE=5
+DB_MAX_OVERFLOW=10
+DB_POOL_TIMEOUT=30
+
+# ==========================================
+# Redis Configuration
+# ==========================================
+REDIS_URL=redis://localhost:6379/0
+REDIS_PASSWORD=
+
+# ==========================================
+# Azure Blob Storage
+# ==========================================
+# Get this from Azure Portal > Storage Account > Access Keys
+AZURE_STORAGE_CONNECTION_STRING=DefaultEndpointsProtocol=https;AccountName=xxx;AccountKey=xxx;EndpointSuffix=core.windows.net
+AZURE_STORAGE_CONTAINER=documents
+AZURE_STORAGE_ACCOUNT_NAME=
+AZURE_STORAGE_ACCOUNT_KEY=
+
+# ==========================================
+# Fortnox OAuth Configuration
+# ==========================================
+# Get these from Fortnox Developer Portal
+FORTNOX_CLIENT_ID=your-fortnox-client-id
+FORTNOX_CLIENT_SECRET=your-fortnox-client-secret
+FORTNOX_REDIRECT_URI=http://localhost:5173/fortnox/callback
+FORTNOX_AUTH_URL=https://apps.fortnox.se/oauth-v1/auth
+FORTNOX_TOKEN_URL=https://apps.fortnox.se/oauth-v1/token
+FORTNOX_API_BASE_URL=https://api.fortnox.se/3
+
+# ==========================================
+# Invoice Master OCR API
+# ==========================================
+# URL of your existing invoice-master API
+OCR_API_URL=http://localhost:8000/api/v1
+OCR_API_KEY=your-ocr-api-key
+OCR_TIMEOUT=60
+
+# ==========================================
+# JWT Configuration
+# ==========================================
+JWT_SECRET_KEY=your-jwt-secret-key-min-32-characters-long
+JWT_ALGORITHM=HS256
+JWT_ACCESS_TOKEN_EXPIRE_MINUTES=15
+JWT_REFRESH_TOKEN_EXPIRE_DAYS=7
+
+# ==========================================
+# Encryption Configuration
+# ==========================================
+# 32-byte base64 encoded key for AES-256 encryption
+ENCRYPTION_KEY=your-32-byte-encryption-key-base64-encoded=
+
+# ==========================================
+# Email Configuration (Optional)
+# ==========================================
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASSWORD=
+SMTP_FROM_EMAIL=noreply@example.com
+
+# ==========================================
+# Logging Configuration
+# ==========================================
+LOG_LEVEL=INFO
+LOG_FORMAT=json
+
+# ==========================================
+# Monitoring (Optional)
+# ==========================================
+APPLICATIONINSIGHTS_CONNECTION_STRING=
+SENTRY_DSN=
+
+# ==========================================
+# Feature Flags
+# ==========================================
+ENABLE_AUTO_SUPPLIER_CREATE=false
+ENABLE_PDF_ATTACHMENT=true
+MAX_FILE_SIZE_MB=10
+ALLOWED_FILE_TYPES=pdf,jpg,jpeg,png