feat(tksupport): Sprint 001 Section C — 전사 휴가관리 구현

- 전사 휴가 부여/관리 (company-holidays) CRUD + 연차차감 트랜잭션
- 전체 휴가관리 대시보드 (vacation-dashboard) 부서별/직원별 현황
- 내 휴가 현황 개선 (/my-status) balance_type별 카드, 전사 휴가일
- requireSupportTeam 미들웨어, 부서명 JOIN, 마이그레이션 002 추가
- 사이드바 roles 기반 메뉴 필터링 (하위호환 유지)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tksupport/web/static/js/tksupport-core.js

@@ -106,10 +106,16 @@ function renderNavbar() {
         { href: '/vacation-request.html', icon: 'fa-paper-plane', label: '휴가 신청', match: ['vacation-request.html'] },
         { href: '/vacation-status.html', icon: 'fa-calendar-check', label: '내 휴가 현황', match: ['vacation-status.html'] },
         { href: '/vacation-approval.html', icon: 'fa-clipboard-check', label: '휴가 승인', match: ['vacation-approval.html'], admin: true },
+        { href: '/company-holidays.html', icon: 'fa-calendar-day', label: '전사 휴가 관리', match: ['company-holidays.html'], roles: ['support_team','admin','system'] },
+        { href: '/vacation-dashboard.html', icon: 'fa-chart-bar', label: '전체 휴가관리', match: ['vacation-dashboard.html'], roles: ['support_team','admin','system'] },
     ];
     const nav = document.getElementById('sideNav');
     if (!nav) return;
-    nav.innerHTML = links.filter(l => !l.admin || isAdmin).map(l => {
+    nav.innerHTML = links.filter(l => {
+        if (l.roles) return currentUser && l.roles.includes(currentUser.role);
+        if (l.admin) return isAdmin;
+        return true;
+    }).map(l => {
         const active = l.match.some(m => currentPage === m || currentPage.endsWith(m));
         return `<a href="${l.href}" class="nav-link flex items-center gap-3 px-4 py-2.5 rounded-lg text-sm transition-colors ${active ? 'active' : 'text-gray-600 hover:bg-gray-100'}">
             <i class="fas ${l.icon} w-5 text-center"></i><span>${l.label}</span></a>`;