refactor: split gateway server methods

src/gateway/server-methods/connect.ts

@@ -0,0 +1,15 @@
+import { ErrorCodes, errorShape } from "../protocol/index.js";
+import type { GatewayRequestHandlers } from "./types.js";
+
+export const connectHandlers: GatewayRequestHandlers = {
+  connect: ({ respond }) => {
+    respond(
+      false,
+      undefined,
+      errorShape(
+        ErrorCodes.INVALID_REQUEST,
+        "connect is only valid as the first request",
+      ),
+    );
+  },
+};