fix: Remove extra braces and properly format WebhookServer class

src/server.ts

@@ -69,11 +69,8 @@ export class WebhookServer {
       await ResponseQueue.add(responses);
     }
   }
-}
-
-}
 
-static start() {
+  static start() {
   if (process.env.NODE_ENV !== 'test') {
     const server = Bun.serve({
       port: PORT,