fix(mining-admin-web): docker-compose 自动连接 rwa-2-network

mining-admin-web 需要同时连接 rwa-network 和 rwa-2-network,
以便通过 Next.js rewrite 直连 rwa-2-network 上的后端服务。

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mining-admin-web/docker-compose.yml

@@ -23,8 +23,12 @@ services:
       start_period: 40s
     networks:
       - rwa-network
+      - rwa-2-network
 
 networks:
   rwa-network:
     external: true
     name: rwa-network
+  rwa-2-network:
+    external: true
+    name: rwa-2-network