Migrate from iOS 17 Observation to iOS 16-compatible Combine architecture.

Lower deployment target to iOS 16, replace @Observable with ObservableObject, add navigation and UI compatibility shims, and include login smoke UI tests.

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

suixinkan/Features/ScenicPermission/ViewModels/PermissionApplyViewModel.swift

@@ -6,7 +6,7 @@
 //
 
 import Foundation
-import Observation
+import Combine
 
 /// 权限申请角色选项实体，表示可申请的一个业务角色。
 struct PermissionRoleOption: Equatable, Identifiable {
@@ -31,21 +31,20 @@ struct ExistingRolePermissionInfo: Equatable, Identifiable {
 }
 
 @MainActor
-@Observable
 /// 权限申请 ViewModel，负责角色/景区选择和提交审核。
-final class PermissionApplyViewModel {
-    var roleOptions: [PermissionRoleOption] = []
-    var selectedRoleId: Int?
-    var scenicOptions: [PermissionScenicOption] = []
-    var loadingScenics = false
-    var scenicLoadFailed = false
-    var scenicLoadFailureReason: String?
-    var submitting = false
-    var message: String?
+final class PermissionApplyViewModel: ObservableObject {
+    @Published var roleOptions: [PermissionRoleOption] = []
+    @Published var selectedRoleId: Int?
+    @Published var scenicOptions: [PermissionScenicOption] = []
+    @Published var loadingScenics = false
+    @Published var scenicLoadFailed = false
+    @Published var scenicLoadFailureReason: String?
+    @Published var submitting = false
+    @Published var message: String?
 
     private let initialPending: RoleApplyPendingResponse?
-    private var rolePermissions: [RolePermissionResponse] = []
-    private var selectedIds: Set<Int> = []
+    @Published private var rolePermissions: [RolePermissionResponse] = []
+    @Published private var selectedIds: Set<Int> = []
 
     /// 初始化权限申请 ViewModel，可传入驳回申请用于编辑回填。
     init(initialPending: RoleApplyPendingResponse? = nil) {
@@ -181,13 +180,12 @@ final class PermissionApplyViewModel {
 }
 
 @MainActor
-@Observable
 /// 权限申请状态 ViewModel，负责读取审核中的或指定编号的权限申请。
-final class PermissionApplyStatusViewModel {
-    var loading = false
-    var pending: RoleApplyPendingResponse?
-    var loadFailed = false
-    var loadFailureReason: String?
+final class PermissionApplyStatusViewModel: ObservableObject {
+    @Published var loading = false
+    @Published var pending: RoleApplyPendingResponse?
+    @Published var loadFailed = false
+    @Published var loadFailureReason: String?
 
     /// 加载权限申请状态；有申请编号时优先匹配编号，否则展示审核中或驳回记录。
     func load(api: any ScenicPermissionServing, applyCode: String?) async {