fix: production readiness — resolve build, lint, and code quality issues

- Fix Next.js build failure: remove duplicate route at (dashboard)/listings/[id]
  that conflicted with (public)/listings/[id] (same URL path in two route groups)
- Fix 772 ESLint errors: auto-fix import ordering (import-x/order), remove unused
  imports/variables, convert empty interfaces to type aliases, replace require()
  with ESM imports, fix consistent-type-imports violations
- Add CLAUDE.md for developer onboarding documentation
- All checks pass: 0 lint errors, typecheck clean, 230 tests passing, build success

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

apps/api/src/modules/auth/domain/entities/user.entity.ts

@@ -1,9 +1,9 @@
-import { AggregateRoot } from '@modules/shared/domain/aggregate-root';
 import { type UserRole, type KYCStatus } from '@prisma/client';
+import { AggregateRoot } from '@modules/shared/domain/aggregate-root';
 import { UserRegisteredEvent } from '../events/user-registered.event';
 import { type Email } from '../value-objects/email.vo';
-import { type Phone } from '../value-objects/phone.vo';
 import { type HashedPassword } from '../value-objects/hashed-password.vo';
+import { type Phone } from '../value-objects/phone.vo';
 
 export interface UserProps {
   email: Email | null;