don't add version header to generated api schema

frontend/orval.config.js

@@ -23,6 +23,11 @@ module.exports = {
                     path: './fetcher.ts',
                     name: 'fetcher',
                 },
+                header: () => [
+                    'Generated by Orval',
+                    'Do not edit manually.',
+                    'See `gen:api` script in package.json',
+                ],
             },
         },
         input: {