Add host stats to the Proxmox page

The Proxmox page only showed guest (VM/LXC) status; there was no view
of the underlying host(s) themselves -- uptime, CPU/RAM usage, or how
full each storage pool is.

New adapter.listNodeStats() calls GET /nodes/{node}/status and GET
/nodes/{node}/storage for every online node (a node going down
shouldn't blank the whole page, same tolerance as listGuests()) and
returns uptime, CPU usage % + core count + load average, RAM/swap
usage, and per-storage (local, LVM-thin, ZFS, NFS, ...) used/total.
New GET /:id/proxmox/nodes route alongside the existing /guests one.

One card per online node now sits above the VM/LXC table, showing
these stats plus a small storage table with usage bars (reusing the
same green/yellow/red thresholds as the Servers detail page and the
Synology page). Handles a multi-node cluster by rendering one card
per node, and storages with no active/total data (e.g. an offline NFS
mount) render as an "Inactive" badge with blank usage instead of
throwing.

Verified end-to-end against a local mock Proxmox API server over real
TLS (a throwaway self-signed cert, matching how the adapter's
`insecure` option is meant to be used) since this sandbox can't reach
the user's actual Proxmox cluster -- confirmed CPU fraction-to-percent
conversion, load average parsing, byte fields, and that a
null-valued/inactive storage doesn't break parsing.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/api/client.ts

@@ -412,6 +412,36 @@ export interface ProxmoxGuestsResponse {
   summary: { total: number; running: number };
 }
 
+export interface ProxmoxStorage {
+  id: string;
+  type: string;
+  active: boolean;
+  shared: boolean;
+  totalBytes: number | null;
+  usedBytes: number | null;
+  availBytes: number | null;
+}
+
+export interface ProxmoxNodeStats {
+  node: string;
+  uptime: number | null;
+  cpuUsagePercent: number | null;
+  cpuCores: number | null;
+  loadAverage: [number, number, number] | null;
+  memTotalBytes: number | null;
+  memUsedBytes: number | null;
+  swapTotalBytes: number | null;
+  swapUsedBytes: number | null;
+  rootfsTotalBytes: number | null;
+  rootfsUsedBytes: number | null;
+  pveVersion: string | null;
+  storages: ProxmoxStorage[];
+}
+
+export interface ProxmoxNodesResponse {
+  nodes: ProxmoxNodeStats[];
+}
+
 export interface SynologyVolume {
   id: string;
   status: string;
@@ -672,6 +702,7 @@ export const api = {
     },
     proxmox: {
       guests: (integrationId: number) => request<ProxmoxGuestsResponse>(`/api/integrations/${integrationId}/proxmox/guests`),
+      nodes: (integrationId: number) => request<ProxmoxNodesResponse>(`/api/integrations/${integrationId}/proxmox/nodes`),
       start: (integrationId: number, node: string, type: ProxmoxGuestType, vmid: number) =>
         request<void>(`/api/integrations/${integrationId}/proxmox/nodes/${node}/${type}/${vmid}/start`, { method: "POST" }),
       stop: (integrationId: number, node: string, type: ProxmoxGuestType, vmid: number) =>