feat(nodes): node detail page — telemetry, containers, commands, controls

/nodes/:id (admin): cpu/mem sparklines from heartbeat history
(1h/24h/7d), containers on node, command history, inline rename,
auto-prune toggle, prune-now with volume opt-in, remove. Agent rows
on the Usage page link into it.

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ROADMAP2.md

@@ -263,8 +263,11 @@ and wired refs, one click or one CLI call.
 - [ ] **Mesh awareness** — agent detects + reports tailscale0/netbird0/
   zt0 IPs at register; backend stores + displays. Optional
   `TAILSCALE_AUTH_KEY` enroll-at-provision later.
-- [ ] **Node detail page** — placed services, telemetry history, agent
-  version + self-upgrade, **drain/cordon**, remove.
+- [x] **Node detail page** — `/nodes/:id` (admin): heartbeat telemetry
+  (cpu/mem sparklines over 1h/24h/7d via `GET /agents/:id/metrics`),
+  containers, command history, rename, auto-prune toggle, prune-now,
+  remove. Drain/cordon and self-upgrade deferred — they need
+  `services.node_id` routing which lands with multi-node scheduling.
 - [x] **Node housekeeping** — agent `prune` + `system_df` commands
   (`docker system prune -af`, volumes excluded unless requested, optional
   `--until`). `node_agents.auto_prune` + the health sweep enqueue a prune