fix: 캘린더 모달 중복 카드 문제 및 삭제 권한 개선

- monthly_worker_status 조회 시 GROUP BY로 중복 데이터 합산
- 작업보고서 삭제 권한을 그룹장 이상으로 제한 (admin, system, group_leader)
- 중복 데이터 정리를 위한 마이그레이션 SQL 추가 (009_fix_duplicate_monthly_status.sql)
- synology_deployment 버전에도 동일 수정 적용

synology_deployment/fastapi-bridge/static/js/calendar.js

@@ -0,0 +1,59 @@
+// ✅ /js/calendar.js
+export function renderCalendar(containerId, onDateSelect) {
+  const container = document.getElementById(containerId);
+  if (!container) return;
+
+  let currentDate = new Date();
+  let selectedDateStr = '';
+
+  function drawCalendar(date) {
+    container.innerHTML = '';
+    const year = date.getFullYear();
+    const month = date.getMonth();
+    const firstDay = new Date(year, month, 1).getDay();
+    const lastDate = new Date(year, month + 1, 0).getDate();
+
+    const nav = document.createElement('div');
+    nav.className = 'nav';
+    const prev = document.createElement('button');
+    prev.textContent = '◀';
+    prev.addEventListener('click', () => {
+      currentDate = new Date(year, month - 1, 1);
+      drawCalendar(currentDate);
+    });
+    const title = document.createElement('div');
+    title.innerHTML = `<strong>${year}년 ${month + 1}월</strong>`;
+    const next = document.createElement('button');
+    next.textContent = '▶';
+    next.addEventListener('click', () => {
+      currentDate = new Date(year, month + 1, 1);
+      drawCalendar(currentDate);
+    });
+    nav.append(prev, title, next);
+    container.appendChild(nav);
+
+    ['일','월','화','수','목','금','토'].forEach(day => {
+      const el = document.createElement('div');
+      el.innerHTML = `<strong>${day}</strong>`;
+      container.appendChild(el);
+    });
+
+    for (let i = 0; i < firstDay; i++) container.appendChild(document.createElement('div'));
+
+    for (let i = 1; i <= lastDate; i++) {
+      const btn = document.createElement('button');
+      const ymd = `${year}-${String(month + 1).padStart(2, '0')}-${String(i).padStart(2, '0')}`;
+      btn.textContent = i;
+      btn.className = (ymd === selectedDateStr) ? 'selected-date' : '';
+      btn.addEventListener('click', () => {
+        selectedDateStr = ymd;
+        drawCalendar(currentDate);
+        onDateSelect(ymd);
+      });
+      container.appendChild(btn);
+    }
+  }
+
+  drawCalendar(currentDate);
+}
+