Add MainHUD gameplay UI, net handshake updates, and server maintenance mode.

Introduce UiManager/MainHUD prefab flow, strengthen GameNet/WsClient, and add AIServer maintenance endpoint support.

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

AIServer/README.md

@@ -8,8 +8,9 @@ C++ 登录 / WebSocket 网关（SQLite），协议兼容客户端 `HotUpdate.Net
 | --- | --- | --- |
 | POST | `/register` | `{"username","password"}` → `{"token","pid"}` |
 | POST | `/login` | 同上 |
-| GET | `/health` | 健康检查 |
-| WS | `/ws?pid={pid}&token={token}` | 无 token → 401；支持 `hello`/`ping` 应用层应答 |
+| GET | `/health` | 健康检查（含 `maintenance`） |
+| GET | `/maintenance` | 维护开关状态 |
+| WS | `/ws?pid={pid}&token={token}` | 无 token → 401；支持 `hello`/`ping`；维护中下发 `maintenance` 后断开 |
 
 本地默认：`http://127.0.0.1:8080`、`ws://127.0.0.1:8080/ws?...`  
 生产由 Caddy TLS 反代到本进程（与 `game.xworld.ren` 部署方式一致）。