Add Gitea CI/CD for hamkadr.ir (Nexus build + self-hosted compose deploy)

- .gitea/workflows/ci-cd.yml: dotnet build via mirror.soroushasadi.com; self-hosted deploy with pg_dump backup, rollback tag, scoped recreate, /healthz wait, prune
- Dockerfile (sdk/aspnet 10 via Nexus) + nuget.docker.config + .dockerignore
- docker-compose.prod.yml: app on 127.0.0.1:APP_PORT, Postgres internal-only + named volume
- deploy/nginx-hamkadr.ir.conf + DEPLOY.md (ports: 22/80/443 only; DB never exposed)
- Prod seeds reference data only (no demo listings); ForwardedHeaders for nginx TLS; /healthz endpoint

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,16 @@
+# Hamkadr (همکادر) — .NET 10 Razor Pages. Images + NuGet pulled through Nexus (mirror.soroushasadi.com).
+FROM mirror.soroushasadi.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY nuget.docker.config /tmp/nuget.config
+COPY src/ ./src/
+RUN dotnet restore src/JobsMedical.Web/JobsMedical.Web.csproj --configfile /tmp/nuget.config
+RUN dotnet publish src/JobsMedical.Web/JobsMedical.Web.csproj -c Release -o /out --no-restore \
+    /p:UseAppHost=false
+
+FROM mirror.soroushasadi.com/dotnet/aspnet:10.0
+WORKDIR /app
+COPY --from=build /out ./
+EXPOSE 8080
+ENV ASPNETCORE_URLS=http://+:8080 \
+    DOTNET_CLI_TELEMETRY_OPTOUT=1
+ENTRYPOINT ["dotnet", "JobsMedical.Web.dll"]