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/web/components/search/property-card.tsx

@@ -2,8 +2,8 @@
 
 import Image from 'next/image';
 import Link from 'next/link';
-import { Card, CardContent } from '@/components/ui/card';
 import { Badge } from '@/components/ui/badge';
+import { Card, CardContent } from '@/components/ui/card';
 import type { ListingDetail } from '@/lib/listings-api';
 
 function formatPrice(priceVND: string): string {

apps/web/components/search/search-results.tsx

@@ -3,8 +3,8 @@
 import * as React from 'react';
 import { Button } from '@/components/ui/button';
 import { Select } from '@/components/ui/select';
-import { PropertyCard } from './property-card';
 import type { ListingDetail, PaginatedResult } from '@/lib/listings-api';
+import { PropertyCard } from './property-card';
 
 interface SearchResultsProps {
   result: PaginatedResult<ListingDetail> | null;