fix(migration): PRAGMA foreign_keys 처리 추가

- PRAGMA foreign_keys = OFF (마이그레이션 시작)
- PRAGMA foreign_keys = ON (마이그레이션 완료 후)
- 프로덕션 배포 완료 (25 queries, 3.55ms)

migrations/001_schema_enhancements.sql

@@ -3,6 +3,11 @@
 -- Date: 2026-01-19
 -- Author: Claude Code
 
+-- =============================================================================
+-- IMPORTANT: Disable FOREIGN KEY constraints during migration
+-- =============================================================================
+PRAGMA foreign_keys = OFF;
+
 -- =============================================================================
 -- STEP 1: user_deposits - Add CHECK constraint for balance >= 0
 -- =============================================================================
@@ -143,6 +148,11 @@ SELECT 'audit_logs', COUNT(*) FROM audit_logs;
 -- INSERT INTO user_deposits (user_id, balance) VALUES (999999, -1000);
 -- INSERT INTO deposit_transactions (user_id, type, amount, depositor_name) VALUES (999999, 'deposit', 1000, 'ThisIsAVeryLongNameThatExceedsFiftyCharactersAndShouldBeTruncatedOrRejected');
 
+-- =============================================================================
+-- Re-enable FOREIGN KEY constraints
+-- =============================================================================
+PRAGMA foreign_keys = ON;
+
 -- =============================================================================
 -- MIGRATION COMPLETE
 -- =============================================================================