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/package.json

@@ -15,6 +15,7 @@
     "zod": "^3.24.0"
   },
   "devDependencies": {
+    "@types/express": "^5.0.6",
     "@types/node": "^22.0.0",
     "typescript": "^5.7.0",
     "vitest": "^3.0.0"
@@ -24,7 +25,11 @@
     "typesense": "^3.0.0"
   },
   "peerDependenciesMeta": {
-    "@nestjs/common": { "optional": true },
-    "typesense": { "optional": true }
+    "@nestjs/common": {
+      "optional": true
+    },
+    "typesense": {
+      "optional": true
+    }
   }
 }