feat(attendance): 주말+회사 휴무일 통합 처리

- monthlyComparisonModel: getCompanyHolidays 추가
- monthlyComparisonController: isHoliday에 company_holidays 포함 + holiday_name
- proxyInputModel: getDailyStatus에 is_holiday/holiday_name 추가
- proxy-input.js: 휴무일 배너 + both_missing 작업자 비활성화 (특근자는 활성 유지)
- 마이그레이션: 2026년 공휴일 16건 일괄 INSERT

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

system1-factory/api/models/proxyInputModel.js

@@ -110,6 +110,16 @@ const ProxyInputModel = {
       WHERE dar.record_date = ? AND dar.vacation_type_id IS NOT NULL
     `, [date]);
 
+    // 5. 해당 날짜가 회사 휴무일인지 확인
+    const [holidayRows] = await db.query(
+      `SELECT holiday_date, holiday_name FROM company_holidays WHERE holiday_date = ?`,
+      [date]
+    );
+    const isCompanyHoliday = holidayRows.length > 0;
+    const holidayName = isCompanyHoliday ? holidayRows[0].holiday_name : null;
+    const dateObj = new Date(date);
+    const isWeekend = dateObj.getDay() === 0 || dateObj.getDay() === 6;
+
     // 메모리에서 조합
     const tbmMap = {};
     tbmAssignments.forEach(ta => {
@@ -158,6 +168,8 @@ const ProxyInputModel = {
 
     return {
       date,
+      is_holiday: isWeekend || isCompanyHoliday,
+      holiday_name: isCompanyHoliday ? holidayName : (isWeekend ? '주말' : null),
       summary: {
         total_active_workers: workers.length,
         tbm_completed: tbmCompleted,