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/Dockerfile

@@ -0,0 +1,15 @@
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+WORKDIR /src
+
+COPY . .
+RUN dotnet restore
+RUN dotnet build -c Release --no-restore
+RUN dotnet publish src/InvoiceMaster.API/InvoiceMaster.API.csproj -c Release -o /app/publish --no-restore
+
+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS runtime
+WORKDIR /app
+COPY --from=build /app/publish .
+
+EXPOSE 8080
+
+ENTRYPOINT ["dotnet", "InvoiceMaster.API.dll"]