补充 Auth/Tasks/ScenicPermission/Live 单元测试，并完善 UI Test 登录与会话稳定性。

移除 LoginViewModel 硬编码账号，扩展登录流程测试覆盖；调整 ZLoginSmokeUITests 执行顺序与路由直达逻辑，避免清空 Keychain 影响其它用例。

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

suixinkanUITests/Auth/ZLoginSmokeUITests.swift

@@ -1,24 +1,22 @@
 //
-//  LoginSmokeUITests.swift
+//  ZLoginSmokeUITests.swift
 //  suixinkanUITests
 //
+//  命名以 Z 开头，确保在全套件末尾执行，避免清空 Keychain 影响其它用例。
+//
 
 import XCTest
 
-final class LoginSmokeUITests: XCTestCase {
-    override class func setUp() {
-        super.setUp()
-        UITestSession.invalidate()
-    }
-
-    override class func tearDown() {
-        UITestSession.invalidate()
-        super.tearDown()
-    }
-
+final class ZLoginSmokeUITests: XCTestCase {
     override func setUp() {
         super.setUp()
         continueAfterFailure = false
+        UITestSession.invalidate()
+    }
+
+    override func tearDown() {
+        UITestSession.invalidate()
+        super.tearDown()
     }
 
     /// 测试冷启动会展示登录页关键控件。
@@ -34,11 +32,13 @@ final class LoginSmokeUITests: XCTestCase {
         XCTAssertTrue(app.application.buttons["login.submit"].exists)
         XCTAssertTrue(app.application.buttons["login.userAgreement"].exists)
         XCTAssertTrue(app.application.buttons["login.privacyPolicy"].exists)
+        app.application.terminate()
     }
 
     /// 测试未勾选协议时无法直接登录。
     func testLoginRequiresPrivacyAgreement() throws {
         let app = SuixinkanApp(resetState: true).launch(waitForLoading: false)
+        defer { app.application.terminate() }
         guard UITestLaunchConfiguration.credentials != nil else {
             throw XCTSkip("缺少 UI Test 账号。")
         }
@@ -51,6 +51,7 @@ final class LoginSmokeUITests: XCTestCase {
     /// 测试空密码不会离开登录页。
     func testEmptyPasswordDoesNotLeaveLoginScreen() throws {
         let app = SuixinkanApp(resetState: true).launch(waitForLoading: false)
+        defer { app.application.terminate() }
         let credentials = try UITestLaunchConfiguration.requireCredentials()
 
         let usernameField = app.application.textFields["login.username"]