refactor(infra): split provider usage

src/infra/provider-usage.fetch.shared.ts

@@ -0,0 +1,14 @@
+export async function fetchJson(
+  url: string,
+  init: RequestInit,
+  timeoutMs: number,
+  fetchFn: typeof fetch,
+): Promise<Response> {
+  const controller = new AbortController();
+  const timer = setTimeout(() => controller.abort(), timeoutMs);
+  try {
+    return await fetchFn(url, { ...init, signal: controller.signal });
+  } finally {
+    clearTimeout(timer);
+  }
+}