Commit MWS backend source tree

The ASP.NET Core solution (mws.api/mws.application/mws.domain/
mws.infrastructure) existed only as untracked working files. Adding
it to version control, plus a .gitignore for build output and local
tooling directories, so the CQRS/mediator refactor plan has a real
git history to branch and diff against.

Dockerfile

@@ -0,0 +1,19 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /app
+
+COPY Mws.slnx ./
+COPY Mws.Domain/*.csproj Mws.Domain/
+COPY Mws.Application/*.csproj Mws.Application/
+COPY Mws.Infrastructure/*.csproj Mws.Infrastructure/
+COPY Mws.Api/*.csproj Mws.Api/
+RUN dotnet restore
+
+COPY app/ app/
+RUN dotnet publish app/Mws.Api -c Release -o /app/publish
+
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
+WORKDIR /app
+COPY --from=build /app/publish .
+ENV ASPNETCORE_URLS=http://+:8080
+EXPOSE 8080
+ENTRYPOINT ["dotnet", "Mws.Api.dll"]