fix(test): replace meaningless assertions and silent skips with proper test semantics

- Replace 4x expect(true).toBe(true) in audit-logger.test.ts with
  applyAuditConfig() + app.getVersion call count assertions
- Replace if(!hasCredentials){return} pattern with it.skipIf() in
  3 integration test files (cleaner, erp-auth, extractor) so Vitest
  correctly reports 12 tests as "skipped" instead of "passed"
- Remove placeholder assertion from skipped update-service test

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

tests/unit/update-service.test.ts

@@ -146,9 +146,8 @@ describe('UpdateService', () => {
 
   // Note: This integration scenario is complex to test in unit tests.
   // Moved to integration tests: tests/integration/update-workflow.test.ts
-  // Skip this test as it requires real integration testing
   it.skip('checks updates for user and auto-downloads available recommendation', async () => {
-    expect(true).toBe(true) // Placeholder - see integration tests
+    // Covered by integration tests
   })
 
   it('returns disabled catalog when update services are unavailable', async () => {