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-registry.service.ts

@@ -0,0 +1,63 @@
+import { Injectable, Inject, type OnModuleInit } from '@nestjs/common';
+import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
+import { MCP_MODULE_OPTIONS, 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;
+
+  constructor(
+    @Inject(MCP_MODULE_OPTIONS) private readonly options: McpModuleOptions,
+  ) {}
+
+  async onModuleInit(): Promise<void> {
+    // Lazy import to avoid hard dependency at module load time
+    const { createPropertySearchServer } = await import('../property-search/property-search.server');
+    const { createMarketAnalyticsServer } = await import('../market-analytics/market-analytics.server');
+    const { createValuationServer } = await import('../valuation/valuation.server');
+
+    // Typesense client is injected from the host app via setTypesenseClient
+    // If not set by the time servers are needed, tools that require it will fail gracefully
+    if (this.typesenseClient) {
+      this.servers.set(
+        'property-search',
+        createPropertySearchServer({
+          typesenseClient: this.typesenseClient,
+          collectionName: this.options.typesenseCollectionName,
+        }),
+      );
+
+      this.servers.set(
+        'market-analytics',
+        createMarketAnalyticsServer({
+          typesenseClient: this.typesenseClient,
+          collectionName: this.options.typesenseCollectionName,
+        }),
+      );
+    }
+
+    this.servers.set(
+      'valuation',
+      createValuationServer({
+        aiServiceBaseUrl: this.options.aiServiceBaseUrl,
+      }),
+    );
+  }
+
+  setTypesenseClient(client: import('typesense').Client): void {
+    this.typesenseClient = client;
+  }
+
+  getServer(name: string): McpServer | undefined {
+    return this.servers.get(name);
+  }
+
+  getServerNames(): string[] {
+    return Array.from(this.servers.keys());
+  }
+
+  getAllServers(): Map<string, McpServer> {
+    return this.servers;
+  }
+}