feat: 支持模拟器定位与地图 fallback

suixinkan/Features/Location/LocationProviding.swift

@@ -16,20 +16,25 @@ struct HomeLocationSnapshot: Sendable, Equatable {
 /// 定位服务协议，便于 ViewModel 注入与单元测试 mock。
 protocol LocationProviding: Sendable {
     /// 按指定精度请求当前坐标与地址。
+    @MainActor
     func requestSnapshot(desiredAccuracy: CLLocationAccuracy) async throws -> HomeLocationSnapshot
     /// 按指定精度请求当前坐标。
+    @MainActor
     func requestCoordinate(desiredAccuracy: CLLocationAccuracy) async throws -> CLLocationCoordinate2D
     /// 逆地理编码。
+    @MainActor
     func reverseGeocode(latitude: Double, longitude: Double) async -> String
 }
 
 extension LocationProviding {
     /// 请求当前坐标与地址，默认使用最高精度以保持既有业务行为。
+    @MainActor
     func requestSnapshot() async throws -> HomeLocationSnapshot {
         try await requestSnapshot(desiredAccuracy: kCLLocationAccuracyBest)
     }
 
     /// 请求当前坐标，默认使用最高精度以保持既有业务行为。
+    @MainActor
     func requestCoordinate() async throws -> CLLocationCoordinate2D {
         try await requestCoordinate(desiredAccuracy: kCLLocationAccuracyBest)
     }