chore: req validation for api/developer (#5482)

server/routes/api/developer/schema.ts

@@ -0,0 +1,10 @@
+import { z } from "zod";
+import BaseSchema from "../BaseSchema";
+
+export const CreateTestUsersSchema = BaseSchema.extend({
+  body: z.object({
+    count: z.coerce.number().default(10),
+  }),
+});
+
+export type CreateTestUsersReq = z.infer<typeof CreateTestUsersSchema>;