chore: add Docker deployment setup and health check wiring

- Add multi-stage Dockerfile for backend (SDK build → ASP.NET runtime,
  non-root user, /health HEALTHCHECK)
- Add docker-compose.dev.yml orchestrating extrudex-api + control-center-web
- Add deploy.sh convenience script wrapping docker compose up --build
- Wire ASP.NET health checks: AddHealthChecks().AddNpgSql() + MapHealthChecks("/health")
- Add backend .dockerignore (comprehensive pattern list)
- Exclude frontend/dist, frontend/node_modules, frontend/.angular from git

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.dev.yml

@@ -0,0 +1,40 @@
+version: '3.8'
+
+services:
+  extrudex-api:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: extrudex-api
+    ports:
+      - "5080:8080"
+    environment:
+      - ASPNETCORE_ENVIRONMENT=Development
+      - ASPNETCORE_URLS=http://+:8080
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    networks:
+      - extrudex-network
+
+  control-center-web:
+    build:
+      context: ../Control-Center/frontend
+      dockerfile: Dockerfile
+    container_name: control-center-web
+    ports:
+      - "5081:80"
+    depends_on:
+      extrudex-api:
+        condition: service_healthy
+    restart: unless-stopped
+    networks:
+      - extrudex-network
+
+networks:
+  extrudex-network:
+    driver: bridge