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()

graphify-out/_query2.py

@@ -0,0 +1,17 @@
+import json
+from pathlib as Path
+from collections import Counter
+
+g = json.loads(Path('graphify-out/graph.json').read_text(encoding='utf-8'))
+nodes = g.get('nodes', [])
+
+# Show all unique node labels to understand project structure
+types = Counter()
+labels = []
+for n in nodes:
+    label = n.get('label', n.get('name', '?'))
+    labels.append(label)
+
+# Show all labels
+for lbl in sorted(labels):
+    print(lbl)