fix(vacation): 배정일수 음수 허용 + 특별휴가 우선 차감

- vbTotalDays min="0" 제거 (보정용 음수 입력 허용)
- deductDays 2단계 차감:
  1단계: vacation_type_id 정확 매칭 잔액 우선 (배우자출산 등)
  2단계: 나머지를 이월→기본→추가→장기→회사 순서로

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

tksupport/api/models/vacationBalanceModel.js

@@ -61,7 +61,9 @@ const vacationBalanceModel = {
     return result;
   },
 
-  // 우선순위: 이월 → 기본연차 → 추가부여 → 장기근속 → 회사부여
+  // 차감 우선순위:
+  // 1. 특별휴가(배우자출산 등) — vacation_type_id가 정확히 일치하는 잔액 먼저
+  // 2. 이월 → 기본연차 → 추가부여 → 장기근속 → 회사부여 순서
   async deductDays(userId, vacationTypeId, year, daysToDeduct, conn) {
     const db = conn || getPool();
     const needRelease = !conn;
@@ -69,16 +71,16 @@ const vacationBalanceModel = {
     try {
       if (needRelease) await c.beginTransaction();
 
-      const [balances] = await c.query(`
+      // 1단계: 해당 vacation_type_id와 정확히 매칭되는 잔액 우선 차감 (특별휴가)
+      const [exactMatch] = await c.query(`
         SELECT id, total_days, used_days, (total_days - used_days) AS remaining_days, balance_type
         FROM sp_vacation_balances
-        WHERE user_id = ? AND year = ? AND (total_days - used_days) > 0
+        WHERE user_id = ? AND year = ? AND vacation_type_id = ? AND (total_days - used_days) > 0
-        ORDER BY FIELD(balance_type, 'CARRY_OVER', 'AUTO', 'MANUAL', 'LONG_SERVICE', 'COMPANY_GRANT')
         FOR UPDATE
-      `, [userId, year]);
+      `, [userId, year, vacationTypeId]);
 
       let remaining = daysToDeduct;
-      for (const b of balances) {
+      for (const b of exactMatch) {
         if (remaining <= 0) break;
         const toDeduct = Math.min(remaining, parseFloat(b.remaining_days));
         if (toDeduct > 0) {
@@ -87,8 +89,30 @@ const vacationBalanceModel = {
         }
       }
 
+      // 2단계: 남은 차감분을 우선순위 순서로 (이미 차감한 행 제외)
+      if (remaining > 0) {
+        const deductedIds = exactMatch.map(b => b.id);
+        const excludeClause = deductedIds.length > 0 ? `AND id NOT IN (${deductedIds.join(',')})` : '';
+        const [balances] = await c.query(`
+          SELECT id, total_days, used_days, (total_days - used_days) AS remaining_days, balance_type
+          FROM sp_vacation_balances
+          WHERE user_id = ? AND year = ? AND (total_days - used_days) > 0 ${excludeClause}
+          ORDER BY FIELD(balance_type, 'CARRY_OVER', 'AUTO', 'MANUAL', 'LONG_SERVICE', 'COMPANY_GRANT')
+          FOR UPDATE
+        `, [userId, year]);
+
+        for (const b of balances) {
+          if (remaining <= 0) break;
+          const toDeduct = Math.min(remaining, parseFloat(b.remaining_days));
+          if (toDeduct > 0) {
+            await c.query('UPDATE sp_vacation_balances SET used_days = used_days + ?, updated_at = NOW() WHERE id = ?', [toDeduct, b.id]);
+            remaining -= toDeduct;
+          }
+        }
+      }
+
       if (needRelease) await c.commit();
-      return { affectedRows: balances.length };
+      return { affectedRows: exactMatch.length };
     } catch (err) {
       if (needRelease) await c.rollback();
       throw err;

user-management/web/index.html

@@ -918,7 +918,7 @@
                     <div class="grid grid-cols-2 gap-3">
                         <div>
                             <label class="block text-xs font-medium text-gray-600 mb-1">배정 일수</label>
-                            <input type="number" id="vbTotalDays" class="input-field w-full px-3 py-1.5 rounded-lg text-sm" value="0" step="0.25" min="0">
+                            <input type="number" id="vbTotalDays" class="input-field w-full px-3 py-1.5 rounded-lg text-sm" value="0" step="0.25">
                         </div>
                         <div>
                             <label class="block text-xs font-medium text-gray-600 mb-1">사용 일수</label>
@@ -2424,7 +2424,7 @@
     <script src="/static/js/tkuser-issue-types.js?v=2026031401"></script>
     <script src="/static/js/tkuser-workplaces.js?v=2026031401"></script>
     <script src="/static/js/tkuser-tasks.js?v=2026031401"></script>
-    <script src="/static/js/tkuser-vacations.js?v=2026033104"></script>
+    <script src="/static/js/tkuser-vacations.js?v=2026033105"></script>
     <script src="/static/js/tkuser-vacation-settings.js?v=2026032501"></script>
     <script src="/static/js/tkuser-layout-map.js?v=2026031401"></script>
     <script src="/static/js/tkuser-partners.js?v=2026031601"></script>