fix(vacation): bulkUpsert 저장 테이블 통일 (sp_vacation_balances)

vacation_balance_details에 쓰고 sp_vacation_balances에서 읽는
테이블 불일치 수정. 경조사 등 특별휴가 저장 후 반영 안 되던 문제 해결.

- bulkUpsert: vacation_balance_details → sp_vacation_balances
- balance_type 전달: CARRY_OVER, AUTO, LONG_SERVICE, COMPANY_GRANT
- 기존 경조사 데이터 21건 sp_vacation_balances로 마이그레이션

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

system1-factory/web/pages/attendance/annual-overview.html

@@ -829,7 +829,8 @@
             user_id: w.user_id,
             vacation_type_id: typeIdMap['CARRYOVER'],
             year: currentYear,
-            total_days: d.carryover
+            total_days: d.carryover,
+            balance_type: 'CARRY_OVER'
           });
         }
         if (typeIdMap['ANNUAL']) {
@@ -837,7 +838,8 @@
             user_id: w.user_id,
             vacation_type_id: typeIdMap['ANNUAL'],
             year: currentYear,
-            total_days: d.annual
+            total_days: d.annual,
+            balance_type: 'AUTO'
           });
         }
         if (typeIdMap['LONG_SERVICE']) {
@@ -845,7 +847,8 @@
             user_id: w.user_id,
             vacation_type_id: typeIdMap['LONG_SERVICE'],
             year: currentYear,
-            total_days: d.longService
+            total_days: d.longService,
+            balance_type: 'LONG_SERVICE'
           });
         }
 
@@ -883,7 +886,8 @@
                 vacation_type_id: specialTypeId,
                 year: currentYear,
                 total_days: special.days,
-                notes: special.typeName || special.type
+                notes: special.typeName || special.type,
+                balance_type: 'COMPANY_GRANT'
               });
             }
           }