fix streaming

server/src/routes.ts

@@ -914,6 +914,7 @@ export async function registerRoutes(app: FastifyInstance) {
     }
 
     reply.raw.writeHead(200, buildSseHeaders(typeof req.headers.origin === "string" ? req.headers.origin : undefined));
+    reply.raw.flushHeaders();
 
     const send = (event: string, data: any) => {
       reply.raw.write(`event: ${event}\n`);