M0: remote access server - Kestrel embedded (token auth/pair/queue API/library/range streaming/web companion zero-install), QR pairing window, DownloadQueueAdapter, auto-start+palette commands. Server E2E green (102 tests)

VideoDownloader.App/MainWindow.xaml.cs

@@ -40,6 +40,9 @@ public partial class MainWindow : Window
     private readonly ObservableCollection<HistoryEntry> _history = new();
     private bool _suggesting; // 주소창 인라인 자동완성 도중 (TextChanged 재귀 방지)
 
+    // M0: 원격 접근 서버(모바일 연동)
+    private Server.ServerHost? _remoteServer;
+
     // Phase D: 미디어 재생목록 (T2-10)
     private readonly MediaPlaylist _playlist = new();
     private PlayerWindow? _player;
@@ -243,6 +246,23 @@ public partial class MainWindow : Window
         };
         _speedTimer.Start();
 
+        // M0: 설정돼 있으면 원격 접근 서버 자동 시작
+        if (_config.RemoteAccessEnabled && !string.IsNullOrEmpty(_config.RemoteAccessToken))
+        {
+            try
+            {
+                _remoteServer = await Server.ServerHost.StartAsync(new Server.ServerOptions
+                {
+                    Port = 0,
+                    Token = _config.RemoteAccessToken!,
+                    LibraryFolder = Path.GetFullPath(_config.OutputFolder),
+                    Queue = new Services.DownloadQueueAdapter(_manager, Dispatcher),
+                });
+                Log($"원격 접근 서버 포트 {_remoteServer.Port}");
+            }
+            catch { }
+        }
+
         // T2-2 탭 절전: 1분마다 유휴(10분+) 비활성 탭 서스펜드
         _suspendService = new TabSuspendService(TimeSpan.FromMinutes(10), tab =>
         {
@@ -879,6 +899,7 @@ public partial class MainWindow : Window
         // T1-10 세션 저장: 탭 URL/활성/핀 보존
         try { if (_tabs != null) TabSessionStore.Save(SessionPath, _tabs.CaptureSession()); } catch { }
         try { _playlist.Save(Path.Combine(AppDataDir, "playlist.json")); } catch { } // T2-10
+        try { if (_remoteServer != null) _ = _remoteServer.DisposeAsync(); } catch { } // M0
     }
 
     // ---- 개인정보 보호 모드 + 브라우저 데이터 관리 ----
@@ -1152,6 +1173,8 @@ public partial class MainWindow : Window
         _palette.Register("이 페이지 즐겨찾기", "bookmark add star", () => AddBookmark_Click(this, new RoutedEventArgs()));
         _palette.Register("미디어 재생목록", "playlist play media 음악 영상", () => { PlaylistPopup.IsOpen = true; });
         _palette.Register("재생목록 재생", "playlist play start", OpenPlayer);
+        _palette.Register("기기 연결 (QR 페어링)", "remote pair qr mobile phone", ShowPairing);
+        _palette.Register("원격 접근 켜기/끄기", "remote server toggle lan", async () => await ToggleRemoteAccess());
         _palette.RegisterSeparator();
         _palette.RegisterDynamic(() => _tabs.Tabs
             .Select(t => new PaletteCommand($"탭 전환: {Trunc(t.Title, 40)}", "tab go switch", () => _tabs.Activate(t)))
@@ -1486,6 +1509,56 @@ public partial class MainWindow : Window
         Log($"워크스페이스 '{ws.Name}' 전환 ({ws.Urls.Count} 탭)");
     }
 
+    // ---- M0 원격 접근(모바일 연동) ----
+    private async Task ToggleRemoteAccess()
+    {
+        if (_remoteServer != null)
+        {
+            await _remoteServer.DisposeAsync();
+            _remoteServer = null;
+            _config.RemoteAccessEnabled = false;
+            ConfigStore.Save(_config);
+            Log("원격 접근을 껐습니다");
+            return;
+        }
+
+        var token = _config.RemoteAccessToken;
+        if (string.IsNullOrEmpty(token))
+        {
+            token = Convert.ToBase64String(System.Security.Cryptography.RandomNumberGenerator.GetBytes(24))
+                .TrimEnd('=').Replace('+', '-').Replace('/', '_');
+            _config.RemoteAccessToken = token;
+        }
+        _config.RemoteAccessEnabled = true;
+        ConfigStore.Save(_config);
+
+        try
+        {
+            _remoteServer = await Server.ServerHost.StartAsync(new Server.ServerOptions
+            {
+                Port = 0,
+                Token = token,
+                LibraryFolder = Path.GetFullPath(_config.OutputFolder),
+                Queue = new Services.DownloadQueueAdapter(_manager, Dispatcher),
+            });
+            Log($"원격 접근 켜짐 — 포트 {_remoteServer.Port}");
+            var pair = new Browser.PairingWindow(_remoteServer, Environment.MachineName) { Owner = this };
+            pair.Show();
+        }
+        catch (Exception ex)
+        {
+            _remoteServer = null;
+            Log($"원격 접근 시작 실패(방화벽 확인): {ex.Message}");
+        }
+    }
+
+    private async void ShowPairing()
+    {
+        if (_remoteServer == null) { await ToggleRemoteAccess(); return; }
+        var pair = new Browser.PairingWindow(_remoteServer, Environment.MachineName) { Owner = this };
+        pair.Show();
+    }
+
     // ---- T2-10 미디어 재생목록 ----
     private void AddToPlaylist(string url, string title, string kind, string? referer)
     {