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>

server/src/integrations/proxmox/adapter.ts

@@ -55,10 +55,37 @@ export interface ProxmoxGuestDetail {
   guestAgentAvailable: boolean;
 }
 
+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 ProxmoxAdapter {
   ping(): Promise<{ ok: boolean; latencyMs?: number; error?: string }>;
   listGuests(): Promise<ProxmoxGuest[]>;
   getGuestDetail(node: string, type: ProxmoxGuestType, vmid: number): Promise<ProxmoxGuestDetail>;
+  listNodeStats(): Promise<ProxmoxNodeStats[]>;
   startGuest(node: string, type: ProxmoxGuestType, vmid: number): Promise<void>;
   stopGuest(node: string, type: ProxmoxGuestType, vmid: number): Promise<void>;
   restartGuest(node: string, type: ProxmoxGuestType, vmid: number): Promise<void>;
@@ -262,6 +289,58 @@ export function createProxmoxAdapter(config: ProxmoxConfig): ProxmoxAdapter {
     };
   }
 
+  async function getNodeStats(node: string): Promise<ProxmoxNodeStats> {
+    const [status, storages] = await Promise.all([
+      api("GET", `/nodes/${node}/status`),
+      api("GET", `/nodes/${node}/storage`),
+    ]);
+
+    const loadavgRaw = Array.isArray(status.loadavg) ? status.loadavg.map((v: string) => Number(v)) : null;
+    const loadAverage: [number, number, number] | null =
+      loadavgRaw && loadavgRaw.length === 3 && loadavgRaw.every((n: number) => Number.isFinite(n))
+        ? (loadavgRaw as [number, number, number])
+        : null;
+
+    return {
+      node,
+      uptime: typeof status.uptime === "number" ? status.uptime : null,
+      cpuUsagePercent: typeof status.cpu === "number" ? status.cpu * 100 : null,
+      cpuCores: typeof status.cpuinfo?.cpus === "number" ? status.cpuinfo.cpus : null,
+      loadAverage,
+      memTotalBytes: typeof status.memory?.total === "number" ? status.memory.total : null,
+      memUsedBytes: typeof status.memory?.used === "number" ? status.memory.used : null,
+      swapTotalBytes: typeof status.swap?.total === "number" ? status.swap.total : null,
+      swapUsedBytes: typeof status.swap?.used === "number" ? status.swap.used : null,
+      rootfsTotalBytes: typeof status.rootfs?.total === "number" ? status.rootfs.total : null,
+      rootfsUsedBytes: typeof status.rootfs?.used === "number" ? status.rootfs.used : null,
+      pveVersion: typeof status.pveversion === "string" ? status.pveversion : null,
+      storages: (Array.isArray(storages) ? storages : []).map((s: any) => ({
+        id: s.storage,
+        type: s.type,
+        active: !!s.active,
+        shared: !!s.shared,
+        totalBytes: typeof s.total === "number" ? s.total : null,
+        usedBytes: typeof s.used === "number" ? s.used : null,
+        availBytes: typeof s.avail === "number" ? s.avail : null,
+      })),
+    };
+  }
+
+  async function listNodeStats(): Promise<ProxmoxNodeStats[]> {
+    const nodes = await listNodes();
+    const perNode = await Promise.all(
+      nodes.map(async (node) => {
+        try {
+          return await getNodeStats(node);
+        } catch {
+          // one unreachable/offline node shouldn't take down the whole stats view
+          return null;
+        }
+      }),
+    );
+    return perNode.filter((n): n is ProxmoxNodeStats => n !== null);
+  }
+
   async function statusAction(node: string, type: ProxmoxGuestType, vmid: number, action: string): Promise<void> {
     await api("POST", `/nodes/${node}/${type}/${vmid}/status/${action}`);
   }
@@ -281,5 +360,5 @@ export function createProxmoxAdapter(config: ProxmoxConfig): ProxmoxAdapter {
     }
   }
 
-  return { ping, listGuests, getGuestDetail, startGuest, stopGuest, restartGuest, shutdownGuest };
+  return { ping, listGuests, getGuestDetail, listNodeStats, startGuest, stopGuest, restartGuest, shutdownGuest };
 }