ci: 改为单 job 直接构建部署，消除 Gitea Registry 依赖

ci.yml: 合并为单 deploy job，runs-on aliyun，apk 安装工具，docker compose up -d --build 直接构建

docker-compose.prod.yml: backend/worker/frontend 改用 build: 块，移除 nginx bind mount

frontend/Dockerfile: 添加 ARG NGINX_CONFIG，生产构建传入 nginx.prod.conf 进镜像

docker-compose.prod.yml

@@ -45,15 +45,17 @@ services:
       retries: 20
 
   backend:
-    image: ${REGISTRY}/${OWNER}/${REPO}/backend-api:${TAG}
+    build:
+      context: .
+      dockerfile: backend/Dockerfile
+      target: api
+    image: vloop-backend-api:latest
     restart: always
     environment:
       CONFIG_PATH: /app/configs/config.yaml
-      # Docker 内部服务发现 —— 覆盖 baked-in config.yaml 中的 localhost
       MYSQL_HOST: mysql
       REDIS_HOST: redis
       RABBITMQ_HOST: rabbitmq
-      # 密码和密钥 —— 从 .env 注入
       MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
       MYSQL_DATABASE: ${MYSQL_DATABASE}
       REDIS_PASSWORD: ${REDIS_PASSWORD}
@@ -76,7 +78,11 @@ services:
       retries: 3
 
   worker:
-    image: ${REGISTRY}/${OWNER}/${REPO}/backend-worker:${TAG}
+    build:
+      context: .
+      dockerfile: backend/Dockerfile
+      target: worker
+    image: vloop-backend-worker:latest
     restart: always
     environment:
       CONFIG_PATH: /app/configs/config.yaml
@@ -103,12 +109,15 @@ services:
       retries: 3
 
   frontend:
-    image: ${REGISTRY}/${OWNER}/${REPO}/frontend:${TAG}
+    build:
+      context: .
+      dockerfile: frontend/Dockerfile
+      args:
+        NGINX_CONFIG: nginx.prod.conf
+    image: vloop-frontend:latest
     restart: always
     ports:
       - "127.0.0.1:9001:80"
-    volumes:
-      - ./nginx.prod.conf:/etc/nginx/conf.d/default.conf:ro
     depends_on:
       - backend
     healthcheck: