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/index.ts

@@ -0,0 +1,23 @@
+// Server factories
+export { createPropertySearchServer } from './property-search/property-search.server';
+export { createMarketAnalyticsServer } from './market-analytics/market-analytics.server';
+export { createValuationServer } from './valuation/valuation.server';
+
+// NestJS integration
+export { McpModule, type McpModuleOptions, MCP_MODULE_OPTIONS } from './nestjs/mcp.module';
+export { McpRegistryService } from './nestjs/mcp-registry.service';
+export { McpTransportController } from './nestjs/mcp-transport.controller';
+
+// Shared types
+export type {
+  PropertySearchDeps,
+  MarketAnalyticsDeps,
+  ValuationDeps,
+  McpServerConfig,
+  PropertySummary,
+  PropertyComparisonResult,
+  MarketReport,
+  PriceTrend,
+  ValuationEstimate,
+  FeatureExtractionResult,
+} from './shared/types';