Reorganize root folder structure: Remove apps layer layer

backend/Dockerfile

@@ -0,0 +1,23 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0-preview AS build
+WORKDIR /app
+
+# Copy everything and restore as distinct layers
+COPY . .
+RUN dotnet restore apps/server-net/Knot.sln
+
+# Build and publish a release
+RUN dotnet publish apps/server-net/src/Host/Host.csproj -c Release -o out
+
+# Build runtime image
+FROM mcr.microsoft.com/dotnet/aspnet:10.0-preview
+WORKDIR /app
+
+# Install native dependencies for Npgsql/GSSAPI
+RUN apt-get update && apt-get install -y libgssapi-krb5-2 && rm -rf /var/lib/apt/lists/*
+
+COPY --from=build /app/out .
+
+EXPOSE 8080
+ENV ASPNETCORE_URLS=http://+:8080
+
+ENTRYPOINT ["dotnet", "Host.dll"]