Integrate Amap SDK to replace CoreLocation and MapKit for all location features.

Unify GPS, reverse geocoding, and map display behind LocationProvider with privacy-gated bootstrap after login, aligned with Android.

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

suixinkan/Features/Location/LocationProviding.swift

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+//
+//  LocationProviding.swift
+//  suixinkan
+//
+
+import CoreLocation
+import Foundation
+
+/// 位置采集结果。
+struct HomeLocationSnapshot: Sendable, Equatable {
+    let latitude: Double
+    let longitude: Double
+    let address: String
+}
+
+/// 定位服务协议，便于 ViewModel 注入与单元测试 mock。
+protocol LocationProviding: Sendable {
+    /// 请求当前坐标与地址。
+    func requestSnapshot() async throws -> HomeLocationSnapshot
+    /// 请求当前坐标。
+    func requestCoordinate() async throws -> CLLocationCoordinate2D
+    /// 逆地理编码。
+    func reverseGeocode(latitude: Double, longitude: Double) async -> String
+}
+
+/// 定位错误。
+enum LocationProviderError: LocalizedError, Equatable {
+    case privacyNotAccepted
+    case permissionDenied
+    case locationFailed
+
+    var errorDescription: String? {
+        switch self {
+        case .privacyNotAccepted:
+            "请先阅读并同意隐私政策"
+        case .permissionDenied:
+            "需要定位权限才能使用此功能"
+        case .locationFailed:
+            "定位失败，请稍后重试"
+        }
+    }
+}
+
+/// 订单核销场景定位错误，保持原有提示文案。
+enum OrderLocationError: LocalizedError {
+    case permissionDenied
+
+    var errorDescription: String? {
+        switch self {
+        case .permissionDenied:
+            "缺少定位权限，功能无法进行"
+        }
+    }
+}