从 iOS 17 Observation 迁移至 iOS 16 兼容的 Combine 架构

将最低部署版本降至 iOS 16，以 ObservableObject 替换 @Observable，新增导航与 UI 兼容层，并补充登录冒烟 UI 测试。

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 {

suixinkan/Features/ScenicPermission/ViewModels/ScenicApplicationViewModel.swift

@@ -6,7 +6,7 @@
 //
 
 import Foundation
-import Observation
+import Combine
 
 /// 景区申请本地图片草稿实体，表示尚未或正在上传的图片。
 struct ScenicApplicationImageDraft: Equatable, Identifiable {
@@ -29,27 +29,26 @@ struct ScenicApplicationImageDraft: Equatable, Identifiable {
 }
 
 @MainActor
-@Observable
 /// 景区申请 ViewModel，负责新增景区申请表单、图片上传和待审核记录回填。
-final class ScenicApplicationViewModel {
-    var scenicName = ""
-    var imageURLs = ""
-    var localImages: [ScenicApplicationImageDraft] = []
-    var selectedProvince = ""
-    var selectedCity = ""
-    var coopType = 1
-    var remark = ""
-    var agreed = false
-    var submitting = false
-    var message: String?
-    var provinces: [ScenicAreaNode] = []
-    var cities: [ScenicAreaNode] = []
-    var pending: ScenicApplicationPendingResponse?
-    var loading = false
-    var loadFailed = false
-    var loadFailureReason: String?
-    var pendingLoadFailed = false
-    var pendingLoadFailureReason: String?
+final class ScenicApplicationViewModel: ObservableObject {
+    @Published var scenicName = ""
+    @Published var imageURLs = ""
+    @Published var localImages: [ScenicApplicationImageDraft] = []
+    @Published var selectedProvince = ""
+    @Published var selectedCity = ""
+    @Published var coopType = 1
+    @Published var remark = ""
+    @Published var agreed = false
+    @Published var submitting = false
+    @Published var message: String?
+    @Published var provinces: [ScenicAreaNode] = []
+    @Published var cities: [ScenicAreaNode] = []
+    @Published var pending: ScenicApplicationPendingResponse?
+    @Published var loading = false
+    @Published var loadFailed = false
+    @Published var loadFailureReason: String?
+    @Published var pendingLoadFailed = false
+    @Published var pendingLoadFailureReason: String?
 
     /// 返回当前申请是否只读；审核中的申请不可再次编辑提交。
     var isReadOnly: Bool {

suixinkan/Features/ScenicPermission/ViewModels/ScenicSelectionViewModel.swift

@@ -7,7 +7,7 @@
 
 import CoreLocation
 import Foundation
-import Observation
+import Combine
 
 /// 景区选择展示实体，表示列表中的一个可切换景区。
 struct ScenicSelectionItem: Equatable, Identifiable {
@@ -51,13 +51,12 @@ struct ScenicSelectionItem: Equatable, Identifiable {
 }
 
 @MainActor
-@Observable
 /// 景区选择 ViewModel，负责搜索、定位距离计算和切换景区持久化。
-final class ScenicSelectionViewModel {
-    var searchQuery = ""
-    var currentLocationText = "定位后获取最近景区"
-    var locationWarning: String?
-    private(set) var items: [ScenicSelectionItem] = []
+final class ScenicSelectionViewModel: ObservableObject {
+    @Published var searchQuery = ""
+    @Published var currentLocationText = "定位后获取最近景区"
+    @Published var locationWarning: String?
+    @Published private(set) var items: [ScenicSelectionItem] = []
 
     /// 返回按搜索关键词过滤后的景区列表。
     var filteredItems: [ScenicSelectionItem] {