fix: resolve test hang issues in CI

- Fixed MSW event listener memory leaks
- Added proper database connection cleanup
- Fixed MSW server lifecycle management
- Reduced global test timeout to 30s for faster failure detection
- Added resource cleanup in all integration tests

This should resolve the GitHub Actions test hanging issue

tests/setup/test-env.ts

@@ -77,7 +77,7 @@ function setTestDefaults(): void {
     TEST_TIMEOUT_UNIT: '5000',
     TEST_TIMEOUT_INTEGRATION: '15000',
     TEST_TIMEOUT_E2E: '30000',
-    TEST_TIMEOUT_GLOBAL: '60000',
+    TEST_TIMEOUT_GLOBAL: '30000', // Reduced from 60s to 30s to catch hangs faster
     
     // Test execution
     TEST_RETRY_ATTEMPTS: '2',