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/LoginFlow.swift

@@ -0,0 +1,104 @@
+//
+//  LoginFlow.swift
+//  suixinkanUITests
+//
+//  Created by Codex on 2026/6/26.
+//
+
+import XCTest
+
+/// 登录与多账号选择流程封装。
+enum LoginFlow {
+    /// 如当前在登录页则执行完整登录，否则直接返回。
+    static func loginIfNeeded(
+        app: SuixinkanApp,
+        credentials: UITestCredentials,
+        file: StaticString = #filePath,
+        line: UInt = #line
+    ) {
+        guard app.isOnLoginScreen else { return }
+
+        fillLoginForm(app: app, credentials: credentials)
+        submitLogin(app: app)
+        handleAccountSelectionIfNeeded(app: app, credentials: credentials)
+        app.waitForGlobalLoadingToDisappear()
+
+        XCTAssertTrue(
+            app.isOnMainTabs,
+            "登录后应进入主 Tab。",
+            file: file,
+            line: line
+        )
+    }
+
+    /// 填写登录表单并勾选协议。
+    static func fillLoginForm(app: SuixinkanApp, credentials: UITestCredentials) {
+        let usernameField = app.application.textFields["login.username"]
+        XCTAssertTrue(usernameField.waitForExistence(timeout: 8))
+        usernameField.tap()
+        usernameField.clearAndType(credentials.phone)
+
+        let passwordField = preferredPasswordField(in: app.application)
+        XCTAssertTrue(passwordField.waitForExistence(timeout: 4))
+        passwordField.tap()
+        passwordField.clearAndType(credentials.password)
+
+        let privacyToggle = app.application.buttons["login.privacy"]
+        if privacyToggle.exists {
+            privacyToggle.tap()
+        }
+    }
+
+    /// 点击登录按钮。
+    static func submitLogin(app: SuixinkanApp) {
+        let submitButton = app.application.buttons["login.submit"]
+        XCTAssertTrue(submitButton.waitForExistence(timeout: 4))
+        submitButton.tap()
+        app.waitForGlobalLoadingToDisappear()
+    }
+
+    /// 处理 v9 多账号选择页。
+    static func handleAccountSelectionIfNeeded(
+        app: SuixinkanApp,
+        credentials: UITestCredentials
+    ) {
+        let accountSelectionTitle = app.application.navigationBars["选择账号"]
+        guard accountSelectionTitle.waitForExistence(timeout: 6) else { return }
+
+        if let accountName = credentials.accountName {
+            let accountCell = app.application.staticTexts[accountName]
+            if accountCell.waitForExistence(timeout: 4) {
+                accountCell.tap()
+            }
+        }
+
+        let confirmButton = app.application.buttons["进入系统"]
+        XCTAssertTrue(confirmButton.waitForExistence(timeout: 4))
+        confirmButton.tap()
+        app.waitForGlobalLoadingToDisappear()
+    }
+
+    /// 优先读取安全输入框，兼容调试构建下的普通文本框。
+    private static func preferredPasswordField(in app: XCUIApplication) -> XCUIElement {
+        let secureField = app.secureTextFields["login.password"]
+        if secureField.exists {
+            return secureField
+        }
+        return app.textFields["login.password"]
+    }
+}
+
+private extension XCUIElement {
+    /// 清空并重新输入文本。
+    func clearAndType(_ text: String) {
+        guard let currentValue = value as? String else {
+            typeText(text)
+            return
+        }
+
+        tap()
+        let deleteString = String(repeating: XCUIKeyboardKey.delete.rawValue, count: currentValue.count)
+        typeText(deleteString)
+        typeText(text)
+    }
+}