fix: resolve all ESLint errors across API and web packages

Fix 19+ lint errors: unused imports (Phone, DuplicateCandidate, listingDetailsSchema),
import ordering violations, consistent-type-imports, and constant binary expression
in test file.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/vitest.config.ts

@@ -1,5 +1,5 @@
-import { defineConfig } from 'vitest/config';
 import path from 'path';
+import { defineConfig } from 'vitest/config';
 
 export default defineConfig({
   test: {