Add Docker deployment as the recommended production setup.

Include Dockerfile, docker-compose on port 3130, npm mirror config, deploy scripts, and DOCKER.md; keep PM2 docs as fallback.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -0,0 +1,16 @@
+services:
+  zhimingge:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: zhimingge:latest
+    container_name: zhimingge
+    restart: unless-stopped
+    ports:
+      - "3130:3130"
+    env_file:
+      - .env.local
+    environment:
+      NODE_ENV: production
+      PORT: "3130"
+      HOSTNAME: "0.0.0.0"