Mac 剪贴板自动同步（上行）+ 菜单栏快捷（Phase 4a）

- MacClipboardMonitor：NSPasteboard changeCount 轮询 500ms + ProcessInfo.beginActivity(.userInitiatedAllowingIdleSystemSleep) 防 App Nap，本机复制的普通文本自动上传云剪贴板。移植桌面 desktop/platform/clipboard.go 的 Monitor 回环守卫（selfHash 自写回声消费一次并解除 + lastHash 去重）与 clipboard_darwin.m 过滤（org.nspasteboard.{Concealed,Transient,AutoGenerated} 敏感标记跳过 / Handoff shared-pasteboard 暂存路径跳过 / 富文本从 RTF·RTFD 派生纯文本）
- EngineController：加 uploadClipboardText(_:)（monitor 直传已解析文本，绕过再读 pasteboard 避免暂存路径等边角，静默不弹空提示）；macOS 写剪贴板前 armSelfWrite 武装守卫（手动拉取写入的内容不被 monitor 再上传成回环）
- 设置加「自动同步本机复制（上行）」开关（@AppStorage macClipboardAutoSync，默认开）；MacRootView 按开关 onAppear/onChange 启停、登出（视图消失）即停；菜单栏加剪贴板上传 / 拉取（登录态）
- 下行自动（远端 → 本机自动写剪贴板）仍待办：共享引擎 JS 仅在手动 clipboardPull 时回灌原生 "clipboard" 通知，远端 SSE clipboard:update 在 WebView 壳不落原生（桌面走 Wails 专路 ApplyRemoteClipboard）；补齐须改 web/src 引擎 + prod 部署（Mac 从线上加载 engine.html）+ 按 device_type=macos 门控免误伤 iOS。手动拉取（设置 / 菜单栏）已可用
- 验证：just mac-build（CommilitiaDropMac.app）+ iOS 模拟器（CommilitiaDrop.app）均 BUILD SUCCEEDED

ios/CDrop/MacApp/MacClipboardMonitor.swift

@@ -0,0 +1,118 @@
+#if os(macOS)
+import AppKit
+import CryptoKit
+import Foundation
+
+// Mac 剪贴板自动同步（上行）：轮询 NSPasteboard.general.changeCount（~500ms），本机复制的普通文本
+// 自动上传云剪贴板。移植桌面 desktop/platform/clipboard.go 的 Monitor 策略（selfHash 回环守卫 +
+// lastHash 去重）与 clipboard_darwin.m 的过滤（org.nspasteboard.{Concealed,Transient,AutoGenerated}
+// 敏感标记跳过、Handoff/shared-pasteboard 暂存路径跳过、富文本从 RTF/RTFD 派生纯文本）。beginActivity
+// 防 App Nap 挂起轮询。下行（远端 → 本机）仍走手动拉取（设置 / 菜单栏）——自动下行须引擎 JS 侧改动 +
+// prod 部署（Mac 从线上加载 engine.html），见 handoff。
+final class MacClipboardMonitor
+{
+    static let shared = MacClipboardMonitor()
+    private init() {}
+
+    // 采纳文本上传去哪：app 在 start 时接好（→ engine.uploadClipboardText）。
+    private var upload: ((String) -> Void)?
+    private var timer: Timer?
+    private var activity: NSObjectProtocol?
+    private var lastChangeCount = 0
+    private var lastHash = ""      // 上次采纳文本的哈希（去重）
+    private var selfHash = ""      // 最近一次自写文本的哈希（回环守卫）
+
+    private static let pollInterval: TimeInterval = 0.5
+
+    var isRunning: Bool { timer != nil }
+
+    func start(upload: @escaping (String) -> Void)
+    {
+        self.upload = upload
+        guard timer == nil else { return }
+        lastChangeCount = NSPasteboard.general.changeCount   // 起始不追认当前已有内容
+        // 防 App Nap：非前台时系统会挂起 Timer，此 activity 令轮询在后台仍运行。
+        activity = ProcessInfo.processInfo.beginActivity(
+            options: .userInitiatedAllowingIdleSystemSleep, reason: "clipboard sync")
+        let t = Timer(timeInterval: Self.pollInterval, repeats: true)
+        { [weak self] _ in self?.poll() }
+        RunLoop.main.add(t, forMode: .common)
+        timer = t
+    }
+
+    func stop()
+    {
+        timer?.invalidate()
+        timer = nil
+        if let activity { ProcessInfo.processInfo.endActivity(activity) }
+        activity = nil
+    }
+
+    // 引擎写本机剪贴板（下行 / 手动拉取）前调用：把即将写入的内容标为「自写」，使随之而来的
+    // changeCount 变化被识别为自身回声、不再上传。对齐桌面 Monitor.WillWrite。
+    func armSelfWrite(_ text: String)
+    {
+        selfHash = Self.hash(text)
+    }
+
+    private func poll()
+    {
+        let cc = NSPasteboard.general.changeCount
+        guard cc != lastChangeCount else { return }
+        lastChangeCount = cc
+        guard let text = Self.readText() else { return }   // 非文本 / 敏感 / 暂存路径 → 忽略
+        let h = Self.hash(text)
+        if h == selfHash { selfHash = ""; lastHash = h; return }   // 自写回声：消费一次并解除守卫
+        if h == lastHash { return }                                 // 内容未变
+        lastHash = h
+        upload?(text)
+    }
+
+    // 读剪贴板纯文本 + 过滤（移植 clipboard_darwin.m）。
+    private static func readText() -> String?
+    {
+        let pb = NSPasteboard.general
+        let sensitive: Set<String> = [
+            "org.nspasteboard.ConcealedType",
+            "org.nspasteboard.TransientType",
+            "org.nspasteboard.AutoGeneratedType",
+        ]
+        if let types = pb.types, types.contains(where: { sensitive.contains($0.rawValue) })
+        {
+            return nil
+        }
+        var s = pb.string(forType: .string)
+        if s == nil || isStagingPath(s!) { s = plainFromRich(pb) }
+        guard let out = s, !isStagingPath(out), !out.isEmpty else { return nil }
+        return out
+    }
+
+    // Universal Clipboard / Handoff 暂存路径（富文本复制时纯文本可能是 .../shared-pasteboard/xxx.rtfd
+    // 这类路径而非内容），绝不当剪贴板文本上传。
+    private static func isStagingPath(_ s: String) -> Bool
+    {
+        s.contains("/shared-pasteboard/") || s.contains("com.apple.coreservices.useractivityd")
+    }
+
+    private static func plainFromRich(_ pb: NSPasteboard) -> String?
+    {
+        for (type, doc) in [ (NSPasteboard.PasteboardType.rtfd, NSAttributedString.DocumentType.rtfd),
+                             (NSPasteboard.PasteboardType.rtf, NSAttributedString.DocumentType.rtf) ]
+        {
+            if let data = pb.data(forType: type),
+               let a = try? NSAttributedString(data: data,
+                                               options: [ .documentType: doc ],
+                                               documentAttributes: nil)
+            {
+                return a.string
+            }
+        }
+        return nil
+    }
+
+    private static func hash(_ s: String) -> String
+    {
+        SHA256.hash(data: Data(s.utf8)).map { String(format: "%02x", $0) }.joined()
+    }
+}
+#endif

ios/CDrop/MacApp/MacMenuContent.swift

@@ -31,6 +31,13 @@ struct MacMenuContent: View
                     .foregroundStyle(.secondary)
             }
 
+            if auth.session != nil
+            {
+                Divider()
+                Button("上传本机剪贴板") { engine.uploadClipboard() }
+                Button("拉取云剪贴板") { engine.pullClipboard() }
+            }
+
             Divider()
             Button("打开主窗口") { openWindow(id: "main") }
             Button("退出") { NSApplication.shared.terminate(nil) }

ios/CDrop/MacApp/MacRootView.swift

@@ -9,6 +9,7 @@ struct MacRootView: View
 {
     @Environment(EngineController.self) private var engine
     @Environment(AuthManager.self) private var auth
+    @AppStorage("macClipboardAutoSync") private var autoSync = true
     @State private var selection: MacSection = .transfers
 
     var body: some View
@@ -54,6 +55,16 @@ struct MacRootView: View
         {
             NoticeOverlay()
         }
+        // 剪贴板自动同步（上行）：登录进壳即按开关启停；开关变化即时生效；登出（本视图消失）停。
+        .onAppear { syncClipboardMonitor() }
+        .onChange(of: autoSync) { syncClipboardMonitor() }
+        .onDisappear { MacClipboardMonitor.shared.stop() }
+    }
+
+    private func syncClipboardMonitor()
+    {
+        if autoSync { MacClipboardMonitor.shared.start { engine.uploadClipboardText($0) } }
+        else { MacClipboardMonitor.shared.stop() }
     }
 
     @ViewBuilder
@@ -198,6 +209,7 @@ struct MacSettingsView: View
 {
     @Environment(EngineController.self) private var engine
     @Environment(AuthManager.self) private var auth
+    @AppStorage("macClipboardAutoSync") private var autoSync = true
     @State private var nameDraft = DeviceNameStore.value
 
     private var signalingLabel: String
@@ -229,6 +241,7 @@ struct MacSettingsView: View
             }
             Section("云剪贴板")
             {
+                Toggle("自动同步本机复制（上行）", isOn: $autoSync)
                 Button("上传本机剪贴板") { engine.uploadClipboard() }
                 Button("拉取云剪贴板到本机") { engine.pullClipboard() }
             }

ios/CDrop/Sources/Engine/EngineController.swift

@@ -558,6 +558,14 @@ final class EngineController: NSObject
         sendCommand("clipboardUpload", payload: [ "content": content ])
     }
 
+    // 指定文本上传云剪贴板（供 Mac 剪贴板自动同步 monitor 直传已解析文本，绕过再读 pasteboard——
+    // 避免富文本 Handoff 暂存路径等边角；静默，不弹空提示）。
+    func uploadClipboardText(_ content: String)
+    {
+        guard !content.isEmpty else { return }
+        sendCommand("clipboardUpload", payload: [ "content": content ])
+    }
+
     // 剪贴板下行：让引擎拉一次云剪贴板，回来写入 UIPasteboard（见 handleNotify "clipboard"）。
     func pullClipboard()
     {
@@ -997,6 +1005,8 @@ extension EngineController: WKScriptMessageHandler
             if let p = payload as? [String: Any], let content = p["content"] as? String, !content.isEmpty
             {
                 #if os(macOS)
+                // 先武装自写守卫（令剪贴板自动同步 monitor 认出刚拉取写入的内容为自身回声、不再上传），再写。
+                MacClipboardMonitor.shared.armSelfWrite(content)
                 NSPasteboard.general.clearContents()
                 NSPasteboard.general.setString(content, forType: .string)
                 #else