feat(mcp): add MCP Server Integration — Property Search, Analytics, Valuation

Implement 3 MCP servers in libs/mcp-servers/ using @modelcontextprotocol/sdk:

- Property Search: NL search via Typesense, property comparison, detail lookup
- Market Analytics: market reports, price trends, district comparison
- Valuation: AVM integration with Python AI service, feature extraction, batch valuation

Includes NestJS integration module with SSE transport for in-process hosting.

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

libs/mcp-servers/src/nestjs/mcp.module.ts

@@ -0,0 +1,28 @@
+import { Module, type DynamicModule, type Provider } from '@nestjs/common';
+import { McpRegistryService } from './mcp-registry.service';
+import { McpTransportController } from './mcp-transport.controller';
+
+export interface McpModuleOptions {
+  aiServiceBaseUrl: string;
+  typesenseCollectionName?: string;
+}
+
+export const MCP_MODULE_OPTIONS = Symbol('MCP_MODULE_OPTIONS');
+
+@Module({})
+export class McpModule {
+  static forRoot(options: McpModuleOptions): DynamicModule {
+    const optionsProvider: Provider = {
+      provide: MCP_MODULE_OPTIONS,
+      useValue: options,
+    };
+
+    return {
+      module: McpModule,
+      controllers: [McpTransportController],
+      providers: [optionsProvider, McpRegistryService],
+      exports: [McpRegistryService],
+      global: false,
+    };
+  }
+}