fix: remove unused imports and fix logger test isolation

- Remove unused imports (run, trackDuration, PerformanceTracker,
  ConfigManager, disconnectDb) flagged by ESLint
- Remove unused isSlow variable in performance-monitor catch block
- Add eslint-disable for require() in Playwright JS script
- Fix logger-performance test flakiness by using vi.resetModules()
  with dynamic imports to prevent cached logger references across
  test files

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

src/main/services/database/data-source.ts

@@ -22,9 +22,12 @@ function getDatabaseType(): 'mysql' | 'mssql' | 'postgres' {
   const configManager = ConfigManager.getInstance()
   const dbType = configManager.getDatabaseType()
   switch (dbType) {
-    case 'sqlserver': return 'mssql'
-    case 'postgresql': return 'postgres'
-    default: return 'mysql'
+    case 'sqlserver':
+      return 'mssql'
+    case 'postgresql':
+      return 'postgres'
+    default:
+      return 'mysql'
   }
 }