新增完整 UI Test 回归套件，并完善启动隔离逻辑。

按模块拆分 XCUITest 用例与 Support 基础设施，UI Test 运行时跳过推送与排队 WebSocket，并将 Podfile 最低版本对齐 iOS 16。

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

suixinkanUITests/Support/UITestAuthenticatedSession.swift

@@ -0,0 +1,24 @@
+//
+//  UITestAuthenticatedSession.swift
+//  suixinkanUITests
+//
+//  Created by Codex on 2026/6/26.
+//
+
+import XCTest
+
+/// 已登录会话启动器，供需要主界面的 UI Test 复用。
+enum UITestAuthenticatedSession {
+    /// 启动 App 并完成登录，返回配置好的应用包装器。
+    static func launchLoggedIn(
+        resetState: Bool = false,
+        file: StaticString = #filePath,
+        line: UInt = #line
+    ) throws -> SuixinkanApp {
+        let credentials = try UITestLaunchConfiguration.requireCredentials(file: file, line: line)
+        let app = SuixinkanApp(resetState: resetState).launch()
+        app.waitForInitialScreen()
+        LoginFlow.loginIfNeeded(app: app, credentials: credentials, file: file, line: line)
+        return app
+    }
+}