refactor: worker_id 잔재 제거 - user_id 기반으로 완전 전환

- workerModel: remove()를 user_id 기반 cascading delete로 전환
- workerController: 계정 생성/해제를 workers.user_id 연결 방식으로 변경
- userController: JOIN 방향 전환 (u.worker_id→w.worker_id 에서 w.user_id→u.user_id)
- authController, systemController, authRoutes: 모든 CRUD에서 worker_id 참조 제거
- DB: UNIQUE KEY 5개 교체, FK 7개 삭제, daily_worker_summary user_id 추가

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

system1-factory/api/models/workerModel.js

@@ -166,32 +166,34 @@ const update = async (worker) => {
   return result.affectedRows;
 };
 
-// 5. 삭제 (외래키 제약조건 처리)
-const remove = async (worker_id) => {
+// 5. 삭제 (user_id 기반 - 외래키 제약조건 처리)
+const remove = async (userId) => {
   const db = await getDb();
   const conn = await db.getConnection();
 
   try {
     await conn.beginTransaction();
 
-    console.log(`🗑️ 작업자 삭제 시작: worker_id=${worker_id}`);
+    console.log(`🗑️ 작업자 삭제 시작: user_id=${userId}`);
 
     // 안전한 삭제: 각 테이블을 개별적으로 처리하고 오류가 발생해도 계속 진행
     const tables = [
-      { name: 'users', query: 'UPDATE users SET worker_id = NULL WHERE worker_id = ?', action: '업데이트' },
-      { name: 'Users', query: 'UPDATE Users SET worker_id = NULL WHERE worker_id = ?', action: '업데이트' },
-      { name: 'daily_issue_reports', query: 'DELETE FROM daily_issue_reports WHERE worker_id = ?', action: '삭제' },
-      { name: 'DailyIssueReports', query: 'DELETE FROM DailyIssueReports WHERE worker_id = ?', action: '삭제' },
-      { name: 'work_reports', query: 'DELETE FROM work_reports WHERE worker_id = ?', action: '삭제' },
-      { name: 'WorkReports', query: 'DELETE FROM WorkReports WHERE worker_id = ?', action: '삭제' },
-      { name: 'daily_work_reports', query: 'DELETE FROM daily_work_reports WHERE worker_id = ?', action: '삭제' },
-      { name: 'monthly_worker_status', query: 'DELETE FROM monthly_worker_status WHERE worker_id = ?', action: '삭제' },
-      { name: 'worker_groups', query: 'DELETE FROM worker_groups WHERE worker_id = ?', action: '삭제' }
+      { name: 'DailyIssueReports', query: 'DELETE FROM DailyIssueReports WHERE user_id = ?', action: '삭제' },
+      { name: 'WorkReports', query: 'DELETE FROM WorkReports WHERE user_id = ?', action: '삭제' },
+      { name: 'daily_work_reports', query: 'DELETE FROM daily_work_reports WHERE user_id = ?', action: '삭제' },
+      { name: 'daily_attendance_records', query: 'DELETE FROM daily_attendance_records WHERE user_id = ?', action: '삭제' },
+      { name: 'daily_worker_summary', query: 'DELETE FROM daily_worker_summary WHERE user_id = ?', action: '삭제' },
+      { name: 'tbm_team_assignments', query: 'DELETE FROM tbm_team_assignments WHERE user_id = ?', action: '삭제' },
+      { name: 'tbm_transfers', query: 'DELETE FROM tbm_transfers WHERE user_id = ?', action: '삭제' },
+      { name: 'vacation_requests', query: 'DELETE FROM vacation_requests WHERE user_id = ?', action: '삭제' },
+      { name: 'vacation_balance_details', query: 'DELETE FROM vacation_balance_details WHERE user_id = ?', action: '삭제' },
+      { name: 'worker_vacation_balance', query: 'DELETE FROM worker_vacation_balance WHERE user_id = ?', action: '삭제' },
+      { name: 'worker_groups', query: 'DELETE FROM worker_groups WHERE user_id = ?', action: '삭제' }
     ];
 
     for (const table of tables) {
       try {
-        const [result] = await conn.query(table.query, [worker_id]);
+        const [result] = await conn.query(table.query, [userId]);
         if (result.affectedRows > 0) {
           console.log(`✅ ${table.name} 테이블 ${table.action}: ${result.affectedRows}건`);
         }
@@ -202,8 +204,8 @@ const remove = async (worker_id) => {
 
     // 마지막으로 작업자 삭제
     const [result] = await conn.query(
-      `DELETE FROM workers WHERE worker_id = ?`,
-      [worker_id]
+      `DELETE FROM workers WHERE user_id = ?`,
+      [userId]
     );
     console.log(`✅ 작업자 삭제 완료: ${result.affectedRows}건`);
 
@@ -212,7 +214,7 @@ const remove = async (worker_id) => {
 
   } catch (err) {
     await conn.rollback();
-    console.error(`❌ 작업자 삭제 오류 (worker_id: ${worker_id}):`, err);
+    console.error(`❌ 작업자 삭제 오류 (user_id: ${userId}):`, err);
     throw new Error(`작업자 삭제 중 오류가 발생했습니다: ${err.message}`);
   } finally {
     conn.release();