feat(sv): Storage · capacity card — ZFS pools, dropped pools, per-CT disk

Read-only Proxmox storage health (same PROXMOX_RO_TOKEN as the cluster card):
ZFS pool health+usage, dropped zfspool storages (the donatello/leonardo SATA
signal), and per-LXC rootfs fill, with a HEALTHY/WATCH/ATTENTION roll-up.
Closes the monitoring gap from the 2026-06-09 audit (C1 + H2 were invisible).
Pure normalizeStorage() unit-tested (4 tests).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "void-server",
-  "version": "2.3.0",
+  "version": "2.4.0",
   "type": "module",
   "private": true,
   "scripts": {