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()

.omo/run-continuation/ses_0dccaec9affeokDqxzoESEknqc.json

@@ -0,0 +1,10 @@
+{
+  "sessionID": "ses_0dccaec9affeokDqxzoESEknqc",
+  "updatedAt": "2026-07-02T15:56:27.603Z",
+  "sources": {
+    "background-task": {
+      "state": "idle",
+      "updatedAt": "2026-07-02T15:56:27.603Z"
+    }
+  }
+}

.omo/run-continuation/ses_0f6f91d66ffexLf0P0aWM1urQ2.json

@@ -0,0 +1,10 @@
+{
+  "sessionID": "ses_0f6f91d66ffexLf0P0aWM1urQ2",
+  "updatedAt": "2026-06-27T20:06:35.253Z",
+  "sources": {
+    "background-task": {
+      "state": "idle",
+      "updatedAt": "2026-06-27T20:06:35.253Z"
+    }
+  }
+}