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>

libs/mcp-servers/src/nestjs/mcp-registry.service.ts

@@ -1,12 +1,13 @@
-import { Injectable, Inject, type OnModuleInit } from '@nestjs/common';
 import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
+import { Injectable, Inject, type OnModuleInit } from '@nestjs/common';
+import type { Client as TypesenseClient } from 'typesense';
 import { MCP_MODULE_OPTIONS } from './mcp.constants';
 import type { McpModuleOptions } from './mcp.module';
 
 @Injectable()
 export class McpRegistryService implements OnModuleInit {
   private readonly servers = new Map<string, McpServer>();
-  private typesenseClient: import('typesense').Client | null = null;
+  private typesenseClient: TypesenseClient | null = null;
 
   constructor(
     @Inject(MCP_MODULE_OPTIONS) private readonly options: McpModuleOptions,
@@ -46,7 +47,7 @@ export class McpRegistryService implements OnModuleInit {
     );
   }
 
-  setTypesenseClient(client: import('typesense').Client): void {
+  setTypesenseClient(client: TypesenseClient): void {
     this.typesenseClient = client;
   }
 

libs/mcp-servers/src/nestjs/mcp-transport.controller.ts

@@ -1,7 +1,7 @@
-import { Controller, Get, Post, Param, Req, Res, HttpException, HttpStatus } from '@nestjs/common';
 import { SSEServerTransport } from '@modelcontextprotocol/sdk/server/sse.js';
+import { Controller, Get, Post, Param, Req, Res, HttpException, HttpStatus } from '@nestjs/common';
 import type { Request, Response } from 'express';
-import { McpRegistryService } from './mcp-registry.service';
+import { type McpRegistryService } from './mcp-registry.service';
 
 @Controller('mcp')
 export class McpTransportController {