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/Views/PermissionApplyView.swift

@@ -9,14 +9,14 @@ import SwiftUI
 
 /// 权限申请页面，支持申请某角色在更多景区下的权限。
 struct PermissionApplyView: View {
-    @Environment(PermissionContext.self) private var permissionContext
-    @Environment(ScenicPermissionAPI.self) private var scenicPermissionAPI
-    @State private var viewModel: PermissionApplyViewModel
+    @EnvironmentObject private var permissionContext: PermissionContext
+    @Environment(\.scenicPermissionAPI) private var scenicPermissionAPI
+    @StateObject private var viewModel: PermissionApplyViewModel
     @State private var activePicker: PermissionPickerSheet?
 
     /// 初始化权限申请页面，可传入驳回记录用于编辑。
     init(initialPending: RoleApplyPendingResponse? = nil) {
-        _viewModel = State(initialValue: PermissionApplyViewModel(initialPending: initialPending))
+        _viewModel = StateObject(wrappedValue: PermissionApplyViewModel(initialPending: initialPending))
     }
 
     var body: some View {