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/config.toml

@@ -0,0 +1,7 @@
+[permissions]
+read = true
+write = true
+execute = true
+
+[permissions.scope]
+paths = ["."]