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

frontend/.env.example

@@ -0,0 +1,2 @@
+VITE_API_URL=http://localhost:5000/api/v1
+VITE_APP_NAME="Invoice Master"