feat: React 프론트엔드 기능 대폭 확장

- 월별근무표: 휴일/근무일 관리, 자동 초기화
- 메일양식: 템플릿 CRUD, To/CC/BCC 설정
- 그룹정보: 부서 관리, 비트 연산 기반 권한 설정
- 업무일지: 수정 성공 메시지 제거, 오늘 근무시간 필터링 수정
- 웹소켓 메시지 type 충돌 버그 수정

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Project/Web/MachineBridge/MachineBridge.cs

@@ -20,12 +20,102 @@ namespace Project.Web
     public partial class MachineBridge
     {
         // Reference to the main form to update logic
-        private Dialog.fDashboardNew _host;
+        private Dialog.fDashboard _host;
 
-        public MachineBridge(Dialog.fDashboardNew host)
+        // WebSocket 서버 인스턴스
+        private static Project.Web.WebSocketServer _wsServer;
+        private static readonly object _wsLock = new object();
+
+        private const int WS_PORT = 8082;
+
+        public MachineBridge(Dialog.fDashboard host)
         {
             _host = host;
+            StartWebSocketServer();
         }
+
+        #region WebSocket Server Control
+
+        /// <summary>
+        /// WebSocket 서버 시작
+        /// </summary>
+        private void StartWebSocketServer()
+        {
+            lock (_wsLock)
+            {
+                if (_wsServer != null)
+                {
+                    Console.WriteLine("[WS] WebSocket server already running");
+                    return;
+                }
+
+                try
+                {
+                    string url = $"http://localhost:{WS_PORT}/";
+                    _wsServer = new Project.Web.WebSocketServer(url, this);
+                    _wsServer.Start();
+                    Console.WriteLine($"[WS] WebSocket server started on port {WS_PORT}");
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"[WS] Failed to start WebSocket server: {ex.Message}");
+                }
+            }
+        }
+
+        /// <summary>
+        /// WebSocket 서버 중지
+        /// </summary>
+        public static void StopWebSocketServer()
+        {
+            lock (_wsLock)
+            {
+                if (_wsServer != null)
+                {
+                    _wsServer.Stop();
+                    _wsServer = null;
+                    Console.WriteLine("[WS] WebSocket server stopped");
+                }
+            }
+        }
+
+        /// <summary>
+        /// WebSocket 서버 실행 여부 확인
+        /// </summary>
+        public static bool IsWebSocketServerRunning()
+        {
+            lock (_wsLock)
+            {
+                return _wsServer != null;
+            }
+        }
+
+        #endregion
+
+        #region App Info
+
+        /// <summary>
+        /// 애플리케이션 버전 정보 반환
+        /// </summary>
+        public string GetAppVersion()
+        {
+            try
+            {
+                return JsonConvert.SerializeObject(new
+                {
+                    Success = true,
+                    ProductName = Application.ProductName,
+                    ProductVersion = Application.ProductVersion,
+                    DisplayVersion = $"{Application.ProductName} v{Application.ProductVersion}"
+                });
+            }
+            catch (Exception ex)
+            {
+                return JsonConvert.SerializeObject(new { Success = false, Message = ex.Message });
+            }
+        }
+
+        #endregion
     }
 
     /// <summary>