feat: 待签合同移到首页分组

frontend/src/components/layout/SidebarNav.tsx

@@ -36,6 +36,7 @@ const navGroups: NavGroup[] = [
     title: '首页',
     items: [
       { path: '/', label: '工作台', icon: LayoutDashboard },
+      { path: '/esign', label: '待签合同', icon: PenTool },
       { path: '/calendar', label: '工作日历', icon: CalendarDays },
     ],
   },
@@ -44,7 +45,6 @@ const navGroups: NavGroup[] = [
     items: [
       { path: '/roster', label: '花名册', icon: Users },
       { path: '/org-chart', label: '组织架构', icon: Building2 },
-      { path: '/esign', label: '待签合同', icon: PenTool },
       { path: '/termination', label: '离职管理', icon: UserX },
       { path: '/training-records', label: '培训记录', icon: GraduationCap },
       { path: '/performance-records', label: '绩效考核', icon: TrendingUp },