fix(security): CRITICAL 보안 이슈 13건 일괄 수정

- SEC-42: JWT algorithm HS256 명시 (sign 5곳, verify 3곳)
- SEC-44: MariaDB/PhpMyAdmin 포트 127.0.0.1 바인딩
- SEC-29: escHtml = escapeHtml alias 추가 (XSS 방지)
- SEC-39: Python Dockerfile 4개 non-root user + chown
- SEC-43: deploy-remote.sh 삭제 (평문 비밀번호 포함)
- SEC-11,12: SQL SET ? → 명시적 컬럼 whitelist + IN절 parameterized
- QA-34: vacation approveRequest/cancelRequest 트랜잭션 래핑
- SEC-32,34: material_comparison.py 5개 엔드포인트 인증 + confirmed_by
- SEC-33: files.py 17개 미인증 엔드포인트 인증 추가
- SEC-37: chatbot 프롬프트 인젝션 방어 (sanitize + XML 구분자)
- SEC-38: fastapi-bridge 프록시 JWT 검증 + 캐시 키 user_id 포함
- SEC-58/QA-98: monthly-comparison API_BASE_URL 수정 + 401 처리
- SEC-61: monthlyComparisonModel SELECT FOR UPDATE 추가
- SEC-63: proxyInputController 에러 메시지 노출 제거
- QA-103: pageAccessRoutes error→message 통일
- SEC-62: tbm-create onclick 인젝션 → data-attribute event delegation
- QA-99: tbm-mobile/create 캐시 버스팅 갱신
- QA-100,101: ESC 키 리스너 cleanup 추가

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

tksupport/api/models/vacationBalanceModel.js

@@ -92,14 +92,15 @@ 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 (${deductedIds.join(',')})` : '';
+        const excludeClause = deductedIds.length > 0 ? `AND id NOT IN (${Array(deductedIds.length).fill('?').join(',')})` : '';
+        const queryParams = [userId, year, ...deductedIds];
         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]);
+        `, queryParams);
 
         for (const b of balances) {
           if (remaining <= 0) break;