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/fMain.Designer.cs

@@ -44,7 +44,6 @@
             this.sbChat = new System.Windows.Forms.ToolStripStatusLabel();
             this.menuStrip1 = new System.Windows.Forms.MenuStrip();
             this.btSetting = new System.Windows.Forms.ToolStripMenuItem();
-            this.로그인ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
             this.commonToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
             this.codesToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
             this.itemsToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
@@ -245,7 +244,6 @@
             this.menuStrip1.Font = new System.Drawing.Font("맑은 고딕", 10F);
             this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
             this.btSetting,
-            this.로그인ToolStripMenuItem,
             this.commonToolStripMenuItem,
             this.managementToolStripMenuItem,
             this.mn_docu,
@@ -269,14 +267,6 @@
             this.btSetting.Text = "설정";
             this.btSetting.Click += new System.EventHandler(this.settingToolStripMenuItem_Click);
             // 
-            // 로그인ToolStripMenuItem
-            // 
-            this.로그인ToolStripMenuItem.Image = ((System.Drawing.Image)(resources.GetObject("로그인ToolStripMenuItem.Image")));
-            this.로그인ToolStripMenuItem.Name = "로그인ToolStripMenuItem";
-            this.로그인ToolStripMenuItem.Size = new System.Drawing.Size(79, 23);
-            this.로그인ToolStripMenuItem.Text = "로그인";
-            this.로그인ToolStripMenuItem.Click += new System.EventHandler(this.로그인ToolStripMenuItem_Click);
-            // 
             // commonToolStripMenuItem
             // 
             this.commonToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
@@ -1269,7 +1259,6 @@
         private System.Windows.Forms.ToolStripMenuItem mn_project;
         private System.Windows.Forms.ToolStripMenuItem projectImportCompleteToolStripMenuItem;
         private System.Windows.Forms.ToolStripMenuItem purchaseOrderImportToolStripMenuItem;
-        private System.Windows.Forms.ToolStripMenuItem 로그인ToolStripMenuItem;
         private System.Windows.Forms.ToolStripMenuItem 메일전송ToolStripMenuItem;
         private System.Windows.Forms.ToolStripMenuItem mn_dailyhistory;
         private System.Windows.Forms.ToolStripMenuItem 패치내역ToolStripMenuItem1;