同步 Android 启动页到 iOS，并在冷启动期间静默恢复登录态。

新增 SplashView、SplashCoordinator 与 Launch Screen 资源，移除冷启动 Lottie；LoginView 加载 App 配置。同时将 token 存储迁移至 UserDefaults，并更新相关测试与文档。

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

suixinkan/Info.plist

@@ -42,7 +42,14 @@
 		<string>remote-notification</string>
 	</array>
 	<key>UILaunchScreen</key>
-	<dict/>
+	<dict>
+		<key>UIColorName</key>
+		<string>LaunchBackground</string>
+		<key>UIImageName</key>
+		<string>SplashLogo</string>
+		<key>UIImageRespectsSafeAreaInsets</key>
+		<true/>
+	</dict>
 	<key>UISupportedInterfaceOrientations</key>
 	<array>
 		<string>UIInterfaceOrientationPortrait</string>