fix: wrap async handler with void for proper promise handling

src/server/routes.ts

@@ -7,7 +7,8 @@ export function setupRoutes(
 	createErrorResponse: (id: string | number | null, code: number, message: string) => JSONRPCResponse
 ): void {
 	// Main MCP endpoint
-	app.post('/mcp', async (req: Request, res: Response) => {
+	app.post('/mcp', (req: Request, res: Response) => {
+		void (async () => {
 			try {
 				const request = req.body as JSONRPCRequest;
 				const response = await handleRequest(request);
@@ -16,6 +17,7 @@ export function setupRoutes(
 				console.error('MCP request error:', error);
 				res.status(500).json(createErrorResponse(null, ErrorCodes.InternalError, 'Internal server error'));
 			}
+		})();
 	});
 
 	// Health check endpoint