test: fix mock configuration and lint errors in unit tests

- Fix logger mock missing default export in extractor.test.ts
- Fix performance-monitor mock configuration
- Fix prefer-const in validation-database.test.ts
- Fix no-unsafe-function-type in cleaner-handler.test.ts
- Fix no-empty-function in cleaner-application-service.test.ts
- Run prettier format on test files

All 622 tests now passing (59 files, 3 skipped)

tests/unit/services/erp/extractor.test.ts

@@ -25,15 +25,18 @@ vi.mock('../../../../src/main/services/logger', () => {
   }
 
   return {
+    default: mockLogger,
     createLogger: vi.fn(() => mockLogger),
     withRequestContext: vi.fn(async (fn) => fn()),
     getRequestId: vi.fn(() => 'test-request-id')
   }
 })
 
-vi.mock('../../../../src/main/services/logger/performance-monitor', () => ({
-  trackDuration: vi.fn(async (fn) => ({ result: await fn() }))
-}))
+vi.mock('../../../../src/main/services/logger/performance-monitor', () => {
+  return {
+    trackDuration: vi.fn(async (fn) => ({ result: await fn() }))
+  }
+})
 
 // Mock ExcelParser - reset in beforeEach
 let mockExcelParserInstance: any