esbuild instead of tsc

src/server.ts

@@ -1,7 +1,7 @@
 import Fastify, { type FastifyInstance } from "fastify";
 import { ToolDef } from "./types";
 import McpSession from "./mcpConnection";
-import { isInitializeRequest } from "@modelcontextprotocol/sdk/types";
+import { isInitializeRequest } from "@modelcontextprotocol/sdk/types.js";
 import { pingTool, testAddTool, testRemoveTool, listToolsTool, invokeToolTool } from "./mcpTools";
 
 export class Server {