feat(mobile,deploy): 接入安卓极光与华为通道并准备公网部署配置

客户端默认指向 jxd.jinniu.ink 的 HTTPS/WSS；登录后把 OpenIM userID 设为极光 alias。
华为 agconnect-services.json 不伪造、不入库。Master Secret 只从服务器文件注入。

Co-authored-by: multica-agent <github@multica.ai>

mobile/lib/screens/login_screen.dart

@@ -6,6 +6,7 @@ import '../config.dart';
 import '../services/auth_api.dart';
 import '../services/call_service.dart';
 import '../services/im_service.dart';
+import '../services/push_service.dart';
 import '../theme.dart';
 import 'home_screen.dart';
 
@@ -92,7 +93,9 @@ class _LoginScreenState extends State<LoginScreen> {
       );
       // 3. 启动通话信令监听
       CallService.instance.start();
-      // 4. 存凭证用于下次自动登录
+      // 4. 极光 alias = OpenIM userID，供服务端离线推送
+      await PushService.instance.bindUser(result.userID);
+      // 5. 存凭证用于下次自动登录
       await LoginScreen.saveCredential(result.userID, result.token, result.nickname);
       if (!mounted) return;
       Navigator.of(context).pushReplacement(
@@ -150,7 +153,7 @@ class _LoginScreenState extends State<LoginScreen> {
     final results = await Future.wait([
       probe('账号服务', '$authApiBase/api/health'),
       probe('消息接口', '$apiAddr/'),
-      probe('消息长连接', 'http://$serverHost:$wsPort/'),
+      probe('消息长连接', wsProbeUrl),
     ]);
     return '自检：${results.join('，')}';
   }

mobile/lib/screens/mine_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
 
 import '../services/im_service.dart';
+import '../services/push_service.dart';
 import '../theme.dart';
 import '../widgets/avatar.dart';
 import 'login_screen.dart';
@@ -166,6 +167,7 @@ class _MineScreenState extends State<MineScreen> {
             onPressed: () async {
               Navigator.of(ctx).pop();
               await LoginScreen.clearCredential();
+              await PushService.instance.unbindUser();
               await IMService.instance.logout();
               if (!mounted) return;
               Navigator.of(context).pushAndRemoveUntil(