style: apply Prettier formatting across codebase

Apply consistent code formatting using Prettier to improve code readability
and maintain style consistency throughout the project.

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

tests/unit/data-importer.test.ts

@@ -116,4 +116,4 @@ describe('DataImportService', () => {
       expect(result.uniqueSourceNumbers).toBeGreaterThanOrEqual(0)
     })
   })
-})
+})