refactor: repartition server-side and client-side code

app/.server/utils/fetch.ts

@@ -0,0 +1,10 @@
+type CommonRequest = Omit<RequestInit, 'body'> & { body?: URLSearchParams | FormData | string };
+
+export async function request(url: string, init?: CommonRequest) {
+  const nodeFetch = await import('node-fetch');
+  const https = await import('node:https');
+
+  const agent = url.startsWith('https') ? new https.Agent({ rejectUnauthorized: false }) : undefined;
+
+  return nodeFetch.default(url, { ...init, agent });
+}