fix(client): 自动连接竞态真因 — 等设置加载完再判(1.0.22)

日志实证:节点就绪(~450ms)与设置加载几乎同时完成,节点回调早 1ms 读到还没加载完的
autoConnect=false → 不连。AppSettings 加 loaded 标志(_load 完成置 true,失败也置);
_maybeAutoConnect 同时监听 nodes + settings,二者都就绪(settings.loaded && 节点 uuid 非空)
才决策一次。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/state/settings_provider.dart

@@ -20,17 +20,21 @@ class AppSettings {
     this.autoConnect = false,
     this.smartRoute = true,
     this.killSwitch = true,
+    this.loaded = false,
   });
   final bool autostart;
   final bool autoConnect; // 启动 app 时自动连接(opt-in,默认关)
   final bool smartRoute;
   final bool killSwitch;
+  final bool loaded; // 是否已从持久化加载完(自动连接要等它 true 再读 autoConnect,避免竞态)
 
-  AppSettings copyWith({bool? autostart, bool? autoConnect, bool? smartRoute, bool? killSwitch}) => AppSettings(
+  AppSettings copyWith({bool? autostart, bool? autoConnect, bool? smartRoute, bool? killSwitch, bool? loaded}) =>
+      AppSettings(
         autostart: autostart ?? this.autostart,
         autoConnect: autoConnect ?? this.autoConnect,
         smartRoute: smartRoute ?? this.smartRoute,
         killSwitch: killSwitch ?? this.killSwitch,
+        loaded: loaded ?? this.loaded,
       );
 }
 
@@ -51,22 +55,25 @@ class SettingsController extends StateNotifier<AppSettings> {
   final bool _desktop = Platform.isMacOS || Platform.isWindows || Platform.isLinux;
 
   Future<void> _load() async {
+    var s = const AppSettings(loaded: true); // 失败也标 loaded:true,自动连接才不会永久等
     try {
       final p = await SharedPreferences.getInstance();
       if (!mounted) return; // 异步初始化期间已 dispose:别再写 state。
-      state = AppSettings(
+      s = AppSettings(
         autostart: p.getBool(_kAutostart) ?? true,
         autoConnect: p.getBool(_kAutoConnect) ?? false,
         smartRoute: p.getBool(_kSmartRoute) ?? true,
         killSwitch: p.getBool(_kKillSwitch) ?? true,
+        loaded: true,
       );
-      logLine('Settings', 'loaded autoConnect=${state.autoConnect} autostart=${state.autostart}');
     } catch (_) {
-      // 测试/无平台:保留默认值。
+      // 测试/无平台:用默认值(已标 loaded)。
     }
     if (!mounted) return;
-    _applyKillSwitch(state.killSwitch);
-    if (_desktop) await _applyAutostart(state.autostart);
+    state = s;
+    logLine('Settings', 'loaded autoConnect=${s.autoConnect} autostart=${s.autostart}');
+    _applyKillSwitch(s.killSwitch);
+    if (_desktop) await _applyAutostart(s.autostart);
   }
 
   Future<void> setAutostart(bool v) async {