fix: bw/stats 404, gateway links, history crash

- swr.ts: remove useBandwidth(), drop bw from useDashboard()
- events/route.ts: skip bandwidth SSE (Kubo 0.28.0 unsupported)
- usage/page.tsx: remove getBWStats call + bw references
- helpers.ts: gatewayLink -> ipfs.maos.dedyn.io (subdomain only)
- upload/page.tsx: fix local gatewayLink (subdomain only)
- storage.ts: update default gatewayUrl, add defensive getHistory()

src/lib/api.ts

@@ -85,7 +85,12 @@ export async function uploadFile(file: File): Promise<{ cid: string; size: numbe
     credentials: 'include',
   });
   if (!res.ok) throw new Error(`Upload failed: ${res.statusText}`);
-  return res.json();
+  const data = await res.json();
+  // Kubo API returns { Hash, Size, Name }, normalize to { cid, size }
+  return {
+    cid: data.cid || data.Hash || data.hash || '',
+    size: data.size || data.Size || 0,
+  };
 }
 
 export async function listFiles(): Promise<{ name: string; cid: string; size: number; modified: string }[]> {