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/search/application/queries/geo-search/geo-search.handler.ts

@@ -1,11 +1,11 @@
-import { type IQueryHandler, QueryHandler } from '@nestjs/cqrs';
 import { Inject } from '@nestjs/common';
-import { GeoSearchQuery } from './geo-search.query';
+import { type IQueryHandler, QueryHandler } from '@nestjs/cqrs';
 import {
   SEARCH_REPOSITORY,
   type ISearchRepository,
   type SearchResult,
 } from '../../../domain/repositories/search.repository';
+import { GeoSearchQuery } from './geo-search.query';
 
 @QueryHandler(GeoSearchQuery)
 export class GeoSearchHandler implements IQueryHandler<GeoSearchQuery> {