fix: resolve all test failures after vitest 2.x upgrade

- Attach rejects handler before advancing timers (vitest 2.x strict mode)
- Fix FK constraint cleanup order in test setup
- Fix 7-char prefix matching test data
- Add INSERT OR IGNORE for deposit concurrency safety
- Add secondary ORDER BY for deterministic transaction ordering
- Update summary-service test assertions to match current prompt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/setup.ts

@@ -72,13 +72,18 @@ beforeAll(async () => {
 afterEach(async () => {
   // DB가 있을 경우만 정리
   if (db) {
-    // 각 테스트 후 데이터 정리 (스키마는 유지)
-    await db.exec('DELETE FROM deposit_transactions');
+    // 각 테스트 후 데이터 정리 (FK 제약 순서 고려)
+    // 1. bank_notifications (참조: deposit_transactions)
     await db.exec('DELETE FROM bank_notifications');
+    // 2. deposit_transactions (참조: users)
+    await db.exec('DELETE FROM deposit_transactions');
+    // 3. user_deposits (참조: users)
     await db.exec('DELETE FROM user_deposits');
+    // 4. 기타 테이블 (참조: users)
     await db.exec('DELETE FROM user_domains');
     await db.exec('DELETE FROM summaries');
     await db.exec('DELETE FROM message_buffer');
+    // 5. users (마지막)
     await db.exec('DELETE FROM users');
   }
 });