移除 MJRefresh 依赖，恢复 SwiftUI 系统下拉刷新。

同时收紧各 ViewModel 内部 isLoading 可见性，避免不必要的视图刷新。

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

suixinkan/Features/LocationReport/ViewModels/LocationReportViewModels.swift

@@ -135,7 +135,7 @@ final class LocationReportHistoryViewModel: ObservableObject {
     @Published var endDate: Date?
     @Published var items: [LocationReportHistoryItem] = []
     @Published var errorMessage: String?
-    @Published var isLoading = false
+    private var isLoading = false
     @Published var isLoadingMore = false
     @Published var total = 0