refactor to not use custom websocket protocol

server/package.json

@@ -9,6 +9,7 @@
     "dev": "tsx watch --clear-screen=false src/index.ts"
   },
   "devDependencies": {
+    "@types/cors": "^2.8.17",
     "@types/eventsource": "^1.1.15",
     "@types/express": "^4.17.21",
     "@types/ws": "^8.5.12",
@@ -17,8 +18,10 @@
     "typescript": "^5.6.2"
   },
   "dependencies": {
+    "cors": "^2.8.5",
     "express": "^4.21.0",
     "mcp-typescript": "file:../packages/mcp-typescript",
-    "ws": "^8.18.0"
+    "ws": "^8.18.0",
+    "zod": "^3.23.8"
   }
 }