fix: 修复生产环境 Drone 部署配置

- 移除 docker compose rebuild，改为直接重启容器
- 后端代码同步到共享目录 /root/aiedu/kaopeilian-backend/app
- 保留多租户选择功能 [all]/[hua]/[cxw,yy,hl]

.drone.yml

@@ -181,7 +181,7 @@ steps:
         - cp -r dist/* /root/aiedu/dist-prod/
         - echo "前端编译完成 -> dist-prod，所有生产租户已更新"
 
-  - name: deploy-tenants
+  - name: deploy-backend
     image: appleboy/drone-ssh
     settings:
       host: 120.79.247.16
@@ -191,9 +191,12 @@ steps:
       port: 22
       command_timeout: 15m
       script:
-        - echo "=== [生产] 部署租户后端 ==="
-        - cd /root/aiedu
+        - echo "=== [生产] 部署后端 ==="
         - |
+          # 同步后端代码到共享目录
+          cp -r /root/aiedu/backend/app/* /root/aiedu/kaopeilian-backend/app/
+          echo "后端代码已同步到共享目录"
+          
           # 获取 commit message
           COMMIT_MSG="${DRONE_COMMIT_MESSAGE}"
           echo "Commit: $COMMIT_MSG"
@@ -213,25 +216,17 @@ steps:
             echo "默认部署所有租户: $TENANTS"
           fi
           
-          # 构建 docker compose 命令
-          BACKEND_SERVICES=""
+          # 重启指定租户的后端容器
           for t in $TENANTS; do
-            BACKEND_SERVICES="$BACKEND_SERVICES ${t}-backend"
+            echo "重启 ${t}-backend ..."
+            docker restart ${t}-backend || echo "警告: ${t}-backend 不存在或重启失败"
           done
           
-          echo "重建后端服务: $BACKEND_SERVICES"
-          docker compose -f docker-compose.prod-multi.yml up -d --build --no-deps $BACKEND_SERVICES
-          
           sleep 10
           docker ps | grep backend
           echo "=== [生产] 部署完成 ==="
           echo "已更新租户: $TENANTS"
 
-volumes:
-  - name: docker-sock
-    host:
-      path: /var/run/docker.sock
-
 ---
 kind: pipeline
 type: docker