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/AuthenticatedUITestCase.swift

@@ -0,0 +1,42 @@
+//
+//  AuthenticatedUITestCase.swift
+//  suixinkanUITests
+//
+//  Created by Codex on 2026/6/26.
+//
+
+import XCTest
+
+/// 需要已登录态的 UI Test 基类，每个测试类只启动并登录一次。
+class AuthenticatedUITestCase: XCTestCase {
+    private static var sharedApp: SuixinkanApp?
+
+    var app: SuixinkanApp!
+
+    override class func setUp() {
+        super.setUp()
+        guard sharedApp == nil else { return }
+        guard UITestLaunchConfiguration.credentials != nil else { return }
+
+        sharedApp = try? UITestAuthenticatedSession.launchLoggedIn()
+    }
+
+    override class func tearDown() {
+        sharedApp?.application.terminate()
+        sharedApp = nil
+        super.tearDown()
+    }
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        continueAfterFailure = false
+
+        guard let sharedApp = Self.sharedApp else {
+            throw XCTSkip("缺少 UI Test 账号或登录失败。")
+        }
+
+        app = sharedApp
+        app.application.activate()
+        app.waitForGlobalLoadingToDisappear()
+    }
+}