Migrate unkown openapi response from string to {}

server/routers/client/createUserClient.ts

@@ -66,7 +66,7 @@ registry.registerPath({
             content: {
                 "application/json": {
                     schema: z.object({
-                        data: z.unknown().nullable(),
+                        data: z.record(z.string(), z.any()).nullable(),
                         success: z.boolean(),
                         error: z.boolean(),
                         message: z.string(),