feat(CUB-64): Docker runtime setup for development & deployment

- Backend Dockerfile: added curl install for health check (not in aspnet base image)
- Frontend Dockerfile: multi-stage Angular build with nginx serving
- Frontend nginx.conf: SPA routing, API proxy, SignalR WebSocket support, health endpoint
- Frontend .dockerignore: excludes node_modules, dist, .angular, etc.
- docker-compose.dev.yml: added PostgreSQL service, fixed frontend context path,
  renamed web service from control-center-web to extrudex-web, added DB env vars,
  proper service dependencies with health checks
- deploy.sh: updated service list to include PostgreSQL port

backend/Dockerfile

@@ -17,6 +17,9 @@ RUN dotnet publish Extrudex.csproj \
 FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS runtime
 WORKDIR /app
 
+# Install curl for health check (not included in aspnet base image)
+RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*
+
 # Non-root user for security
 RUN adduser --disabled-password --gecos "" appuser
 USER appuser