fix: 修复手机连不上服务器时启动页无限转圈（B-58）

- 启动页先读本地凭证：无凭证（首次打开）直接进登录页，不再先等 SDK 初始化
- SDK init/login 加 20s 超时；init 用共享 Future 防止超时后重复触发 initSDK
- 登录页对 IM 登录超时给出明确提示（确认手机连着公司内网 WiFi）
- 修复 flutter create 模板遗留的 widget_test（引用不存在的 MyApp），改为登录页渲染冒烟测试
- 版本号 1.0.1+2

mobile/lib/main.dart

@@ -77,18 +77,24 @@ class _SplashGateState extends State<SplashGate> {
 
   Future<void> _boot() async {
     final im = IMService.instance;
+    // 先读本地凭证：没有凭证（首次打开）直接去登录页，
+    // 不在启动页等 SDK 初始化——服务器连不上时 initSDK 可能长时间不返回，
+    // 不能让启动页一直转圈。
+    final credential = await LoginScreen.readCredential();
+    if (credential == null) {
+      if (!mounted) return;
+      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const LoginScreen()));
+      return;
+    }
     try {
-      await im.init();
+      await im.init().timeout(const Duration(seconds: 20));
-      final credential = await LoginScreen.readCredential();
+      await im.login(userID: credential.$1, token: credential.$2).timeout(const Duration(seconds: 20));
-      if (credential != null) {
+      CallService.instance.start();
-        await im.login(userID: credential.$1, token: credential.$2);
+      if (!mounted) return;
-        CallService.instance.start();
+      Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const HomeScreen()));
-        if (!mounted) return;
+      return;
-        Navigator.of(context).pushReplacement(MaterialPageRoute(builder: (_) => const HomeScreen()));
-        return;
-      }
     } catch (_) {
-      // 自动登录失败（token 失效等）：清凭证回登录页
+      // 自动登录失败（token 失效、服务器连不上等）：清凭证回登录页
       await LoginScreen.clearCredential();
     }
     if (!mounted) return;

mobile/lib/screens/login_screen.dart

@@ -78,8 +78,11 @@ class _LoginScreenState extends State<LoginScreen> {
         password: password,
         platformID: IMService.instance.platformID,
       );
-      // 2. 登录 OpenIM SDK
+      // 2. 登录 OpenIM SDK（服务器连不上时这一步可能长时间不返回，加超时兜底）
-      await IMService.instance.login(userID: result.userID, token: result.token);
+      await IMService.instance.login(userID: result.userID, token: result.token).timeout(
+        const Duration(seconds: 20),
+        onTimeout: () => throw AuthException('连不上消息服务器，请确认手机连着公司内网 WiFi'),
+      );
       // 3. 启动通话信令监听
       CallService.instance.start();
       // 4. 存凭证用于下次自动登录

mobile/lib/services/im_service.dart

@@ -75,9 +75,24 @@ class IMService extends ChangeNotifier {
 
   int get platformID => Platform.isIOS ? IMPlatform.ios : IMPlatform.android;
 
-  /// App 启动时初始化 SDK（只做一次）
+  /// App 启动时初始化 SDK（只做一次）。
-  Future<void> init() async {
+  /// 用共享 Future 防止超时后重复触发 initSDK：第一次调用还在跑时，
-    if (sdkReady) return;
+  /// 后续调用直接复用同一个 Future；失败了则允许下次重试。
+  Future<void>? _initFuture;
+
+  Future<void> init() {
+    if (sdkReady) return Future.value();
+    final inFlight = _initFuture;
+    if (inFlight != null) return inFlight;
+    final future = _doInit();
+    _initFuture = future;
+    return future.whenComplete(() {
+      // 失败的初始化允许重试；成功的保留 sdkReady 标记即可
+      if (!sdkReady && identical(_initFuture, future)) _initFuture = null;
+    });
+  }
+
+  Future<void> _doInit() async {
     final dir = await getApplicationDocumentsDirectory();
     final dataDir = '${dir.path}/openim';
     await Directory(dataDir).create(recursive: true);

mobile/pubspec.yaml

@@ -1,7 +1,7 @@
 name: changlian
 description: 畅联 —— 公司内部通讯 App（手机端）
 publish_to: "none"
-version: 1.0.0+1
+version: 1.0.1+2
 
 environment:
   sdk: ">=3.6.0 <4.0.0"

mobile/test/widget_test.dart

@@ -1,30 +1,11 @@
-// This is a basic Flutter widget test.
+import 'package:changlian/screens/login_screen.dart';
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import 'package:changlian/main.dart';
-
 void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
+  testWidgets('登录页能正常渲染', (tester) async {
-    // Build our app and trigger a frame.
+    await tester.pumpWidget(const MaterialApp(home: LoginScreen()));
-    await tester.pumpWidget(const MyApp());
+    expect(find.text('畅联'), findsOneWidget);
-
+    expect(find.text('登录'), findsOneWidget);
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
-
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
-
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
   });
 }