新增打卡点与位置上报模块，并接入首页路由

将打卡点管理与位置上报从占位页迁移为完整 MVVM 流程，包含前台定位支持与单元测试。

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

suixinkan/Core/Location/ForegroundLocationProvider.swift

@@ -0,0 +1,107 @@
+//
+//  ForegroundLocationProvider.swift
+//  suixinkan
+//
+//  Created by Codex on 2026/6/24.
+//
+
+import CoreLocation
+import Foundation
+import Observation
+
+/// 前台定位结果实体，表示一次即时定位得到的坐标和可展示地址。
+struct ForegroundLocationResult: Equatable {
+    let latitude: Double
+    let longitude: Double
+    let address: String
+}
+
+/// 前台定位 Provider，只负责当前页面主动请求位置，不缓存、不后台持续定位。
+@MainActor
+@Observable
+final class ForegroundLocationProvider: NSObject {
+    @ObservationIgnored private let manager = CLLocationManager()
+    @ObservationIgnored private let geocoder = CLGeocoder()
+    @ObservationIgnored private var continuation: CheckedContinuation<ForegroundLocationResult, Error>?
+
+    override init() {
+        super.init()
+        manager.delegate = self
+        manager.desiredAccuracy = kCLLocationAccuracyBest
+    }
+
+    /// 请求一次当前位置，成功后尝试反解析为地址。
+    func requestCurrentLocation() async throws -> ForegroundLocationResult {
+        if let continuation {
+            continuation.resume(throwing: LocationProviderError.duplicatedRequest)
+            self.continuation = nil
+        }
+        let status = manager.authorizationStatus
+        if status == .notDetermined {
+            manager.requestWhenInUseAuthorization()
+        }
+
+        return try await withCheckedThrowingContinuation { continuation in
+            self.continuation = continuation
+            manager.requestLocation()
+        }
+    }
+
+    /// 将 CLLocation 转为页面可展示的定位结果。
+    private func makeResult(from location: CLLocation) async -> ForegroundLocationResult {
+        let address: String
+        if let placemark = try? await geocoder.reverseGeocodeLocation(location).first {
+            address = [
+                placemark.administrativeArea,
+                placemark.locality,
+                placemark.subLocality,
+                placemark.thoroughfare,
+                placemark.name
+            ]
+            .compactMap { $0 }
+            .filter { !$0.isEmpty }
+            .joined(separator: "")
+        } else {
+            address = "当前位置"
+        }
+        return ForegroundLocationResult(
+            latitude: location.coordinate.latitude,
+            longitude: location.coordinate.longitude,
+            address: address.isEmpty ? "当前位置" : address
+        )
+    }
+}
+
+extension ForegroundLocationProvider: CLLocationManagerDelegate {
+    /// 定位成功回调，返回最近一次坐标。
+    nonisolated func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
+        guard let location = locations.last else { return }
+        Task { @MainActor in
+            guard let continuation = self.continuation else { return }
+            self.continuation = nil
+            let result = await self.makeResult(from: location)
+            continuation.resume(returning: result)
+        }
+    }
+
+    /// 定位失败回调，将错误传给当前请求方。
+    nonisolated func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
+        Task { @MainActor in
+            guard let continuation = self.continuation else { return }
+            self.continuation = nil
+            continuation.resume(throwing: error)
+        }
+    }
+}
+
+/// 前台定位 Provider 错误实体。
+enum LocationProviderError: LocalizedError {
+    case duplicatedRequest
+
+    var errorDescription: String? {
+        switch self {
+        case .duplicatedRequest:
+            "已有定位请求正在执行"
+        }
+    }
+}