fix(tkuser): 연차 배정 모달 간소화 — 휴가유형 드롭다운 제거

- "휴가 유형" 드롭다운 → hidden (vacation_type_id 자동 설정)
- "배정 유형"이 메인 셀렉터: 기본연차/이월/장기근속/경조사
- balance_type별 vacation_type_id 자동 매핑:
  AUTO/MANUAL→ANNUAL_FULL, CARRY_OVER→CARRYOVER, LONG_SERVICE→LONG_SERVICE
- 경조사(COMPANY_GRANT) 선택 시 서브 드롭다운 표시

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

system1-factory/api/index.js

@@ -48,7 +48,7 @@ async function runStartupMigrations() {
     const fs = require('fs');
     const path = require('path');
     const db = await getDb();
-    const migrationFiles = ['20260326_schedule_extensions.sql', '20260330_add_proxy_input_fields.sql', '20260330_create_monthly_work_confirmations.sql'];
+    const migrationFiles = ['20260326_schedule_extensions.sql', '20260330_add_proxy_input_fields.sql', '20260330_create_monthly_work_confirmations.sql', '20260331_fix_deduct_days_precision.sql'];
     for (const file of migrationFiles) {
       const sqlPath = path.join(__dirname, 'db', 'migrations', file);
       if (!fs.existsSync(sqlPath)) continue;