完善 OTG 相机有线传图：支持 Sony/Canon 自动识别，页面 detach 保持会话以便再次进入复连。

引入进程级 CameraTetheringSession 与共享 USB Browser；离开传图页仅取消 UI 回调，App 终止时再完整 shutdown 释放 PTP 与 Browser 资源。

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

suixinkan/Core/CameraTransfer/CameraTransferPipeline.swift

@@ -26,10 +26,21 @@ final class CameraTransferPipeline {
     private let maxRetries = 3
     private let deferredNotifyInterval: TimeInterval = 0.15
     private let maxConcurrentUploads = 3
+    private var isUIAttached = false
 
     /// 初始化传输管道，并注入相机服务。
     init(cameraService: any CameraServiceProtocol) {
         self.cameraService = cameraService
+    }
+
+    /// 绑定 UI 回调；再次进入 OTG 页时重新 attach。
+    func attachToUI(
+        onConnectionStateChange: @escaping (CameraConnectionState) -> Void,
+        onTasksUpdated: @escaping ([CameraTransferTask]) -> Void
+    ) {
+        isUIAttached = true
+        self.onTasksUpdated = onTasksUpdated
+        cameraService.onConnectionStateChange = onConnectionStateChange
         cameraService.onNewAsset = { [weak self] asset in
             Task { @MainActor in
                 await self?.handleNewAsset(asset, skipIfExists: false)
@@ -37,6 +48,18 @@ final class CameraTransferPipeline {
         }
     }
 
+    /// 页面离开：取消 UI 回调与进行中的上传通知，保持相机连接。
+    func detachFromUI() {
+        guard isUIAttached else { return }
+        isUIAttached = false
+        pendingDeferredNotifyTask?.cancel()
+        pendingDeferredNotifyTask = nil
+        activeUploadAssetIDs.removeAll()
+        inFlightAssetIDs.removeAll()
+        onTasksUpdated = nil
+        cameraService.detachFromUI()
+    }
+
     /// 配置上传 Sink、自动上传开关与可选下载作用域。
     func configure(
         uploadSink: (any CameraAssetUploadSink)?,
@@ -50,14 +73,33 @@ final class CameraTransferPipeline {
         }
     }
 
-    /// 启动相机连接。
+    /// 启动相机连接；已连接时同步已有照片。
     func connect() async {
         await cameraService.connect()
+        if cameraService.connectionState.isConnected {
+            await syncExistingPhotos()
+        }
     }
 
-    /// 断开相机连接。
+    /// 完整释放相机资源（App 终止或测试 teardown）。
+    func shutdown() async {
+        detachFromUI()
+        await cameraService.shutdown()
+    }
+
+    /// 断开相机连接（兼容旧调用，语义等同 shutdown）。
     func disconnect() async {
-        await cameraService.disconnect()
+        await shutdown()
+    }
+
+    /// 重新搜索 USB 相机。
+    func restartCameraDiscovery() async {
+        if let autoDetect = cameraService as? AutoDetectCameraService {
+            await autoDetect.restartDiscovery()
+            return
+        }
+        await cameraService.shutdown()
+        await cameraService.connect()
     }
 
     /// 当前相机连接状态。
@@ -65,14 +107,6 @@ final class CameraTransferPipeline {
         cameraService.connectionState
     }
 
-    /// 设置连接状态变化回调。
-    var onConnectionStateChange: ((CameraConnectionState) -> Void)? {
-        get { nil }
-        set {
-            cameraService.onConnectionStateChange = newValue
-        }
-    }
-
     /// 重试所有失败的上传任务。
     func retryFailedUploads() async {
         guard uploadEnabled, uploadSink != nil else { return }