feat(tksupport): 휴가 보정 관리 페이지 추가 — 캘린더 기반 추가/삭제

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

tksupport/api/models/vacationRequestModel.js

@@ -1,8 +1,8 @@
 const { getPool } = require('../middleware/auth');
 
 const vacationRequestModel = {
-  async create(data) {
-    const db = getPool();
+  async create(data, conn) {
+    const db = conn || getPool();
     const [result] = await db.query('INSERT INTO sp_vacation_requests SET ?', data);
     return result;
   },
@@ -85,8 +85,8 @@ const vacationRequestModel = {
     return result;
   },
 
-  async updateStatus(requestId, statusData) {
-    const db = getPool();
+  async updateStatus(requestId, statusData, conn) {
+    const db = conn || getPool();
     const [result] = await db.query(`
       UPDATE sp_vacation_requests
       SET status = ?, reviewed_by = ?, reviewed_at = NOW(), review_note = ?