system-monitor: /system-monitor route (CPU/mem/disk/processes) + page titles

- Backend GET /api/system-monitor/stats: one snapshot — CPU overall + per-core
  (two /proc/stat samples), memory + swap (/proc/meminfo), disks (df), load,
  uptime, top-20 processes (ps). Owner-only via the account gate.
- Frontend /system-monitor screen: polls every 2s; CPU/Memory/Disks cards with
  bars + per-core mini-bars, top-processes table. Nav dock "Monitor" item.
- Register /music and /system-monitor in usePageTitle RULES so the browser tab
  and editable header title update on those routes (/music was missing too).

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

src/apps/officer-web/Screens/Dashboard/Layout/Dock.tsx

@@ -129,6 +129,7 @@ import {
   MonitorSmartphone,
   Workflow,
   Music,
+  Activity,
 } from 'lucide-react';
 
 export const ALL_DOCK_ITEMS: DockItem[] = [
@@ -145,6 +146,7 @@ export const ALL_DOCK_ITEMS: DockItem[] = [
   { label: 'Projects', to: '/projects', icon: FolderKanban, color: '#10b981' },
   { label: 'Browser', to: '/browser', icon: Globe, color: '#06b6d4' },
   { label: 'Desktop', to: '/desktop', icon: MonitorSmartphone, color: '#ec4899' },
+  { label: 'Monitor', to: '/system-monitor', icon: Activity, color: '#0ea5e9' },
   { label: 'Dashboards', to: '/dashboards', icon: LayoutGrid, color: '#8b5cf6' },
 ];
 

src/apps/officer-web/Screens/Dashboard/SystemMonitor/SystemMonitorScreen.tsx

@@ -0,0 +1,204 @@
+import { useEffect, useRef, useState } from 'react';
+import { useClient } from 'hooks/useClient';
+import { Cpu, MemoryStick, HardDrive, Server, Activity } from 'lucide-react';
+
+type Stats = {
+  hostname: string;
+  platform: string;
+  uptimeSec: number;
+  loadavg: number[];
+  cpu: { model: string; cores: number; usagePct: number; perCore: number[] };
+  mem: {
+    totalBytes: number;
+    usedBytes: number;
+    freeBytes: number;
+    usedPct: number;
+    swapTotalBytes: number;
+    swapUsedBytes: number;
+  } | null;
+  disks: { mount: string; fsType: string; totalBytes: number; usedBytes: number; usedPct: number }[];
+  processes: { pid: number; user: string; cpuPct: number; memPct: number; command: string }[];
+  timestamp: number;
+};
+
+const POLL_MS = 2000;
+
+function fmtBytes(n: number): string {
+  if (!n) return '0 B';
+  const units = ['B', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.min(units.length - 1, Math.floor(Math.log(n) / Math.log(1024)));
+  return `${(n / 1024 ** i).toFixed(i === 0 ? 0 : 1)} ${units[i]}`;
+}
+
+function fmtUptime(sec: number): string {
+  const d = Math.floor(sec / 86400);
+  const h = Math.floor((sec % 86400) / 3600);
+  const m = Math.floor((sec % 3600) / 60);
+  return [d && `${d}d`, (d || h) && `${h}h`, `${m}m`].filter(Boolean).join(' ');
+}
+
+const barColor = (pct: number) =>
+  pct >= 85 ? 'bg-red-500' : pct >= 60 ? 'bg-amber-500' : 'bg-emerald-500';
+
+const Bar = ({ pct }: { pct: number }) => (
+  <div className="h-2 w-full overflow-hidden rounded-full bg-muted">
+    <div className={`h-full rounded-full transition-all ${barColor(pct)}`} style={{ width: `${Math.min(100, pct)}%` }} />
+  </div>
+);
+
+const Card = ({ title, icon: Icon, children }: { title: string; icon: typeof Cpu; children: React.ReactNode }) => (
+  <div className="flex flex-col gap-3 rounded-xl border border-border bg-card p-4">
+    <div className="flex items-center gap-2 text-sm font-medium text-muted-foreground">
+      <Icon size={16} className="text-primary" />
+      {title}
+    </div>
+    {children}
+  </div>
+);
+
+export const SystemMonitorScreen = () => {
+  const { get } = useClient();
+  const [stats, setStats] = useState<Stats | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const alive = useRef(true);
+
+  useEffect(() => {
+    alive.current = true;
+    const tick = () => {
+      get<Stats>('/system-monitor/stats')
+        .then((s) => {
+          if (alive.current) {
+            setStats(s);
+            setError(null);
+          }
+        })
+        .catch(() => alive.current && setError('Failed to read system stats'));
+    };
+    tick();
+    const id = setInterval(tick, POLL_MS);
+    return () => {
+      alive.current = false;
+      clearInterval(id);
+    };
+  }, []);
+
+  return (
+    <div className="h-full w-full overflow-y-auto p-4 md:p-6">
+      <div className="mx-auto flex max-w-6xl flex-col gap-5">
+        {/* Header */}
+        <div className="flex flex-wrap items-center justify-between gap-3">
+          <div className="flex items-center gap-3">
+            <Activity className="text-primary" />
+            <div>
+              <h1 className="text-lg font-semibold text-foreground">System Monitor</h1>
+              <p className="text-xs text-muted-foreground">
+                {stats ? `${stats.hostname} · ${stats.platform}` : 'Loading…'}
+              </p>
+            </div>
+          </div>
+          {stats && (
+            <div className="flex items-center gap-4 text-xs text-muted-foreground">
+              <span>up {fmtUptime(stats.uptimeSec)}</span>
+              <span>load {stats.loadavg.map((l) => l.toFixed(2)).join('  ')}</span>
+              <span className="inline-flex h-2 w-2 animate-pulse rounded-full bg-emerald-500" title="live" />
+            </div>
+          )}
+        </div>
+
+        {error && <div className="rounded-lg border border-red-500/40 bg-red-500/10 p-3 text-sm text-red-500">{error}</div>}
+
+        {stats && (
+          <>
+            <div className="grid grid-cols-1 gap-4 lg:grid-cols-3">
+              {/* CPU */}
+              <Card title="CPU" icon={Cpu}>
+                <div className="flex items-end justify-between">
+                  <span className="text-3xl font-semibold text-foreground">{stats.cpu.usagePct.toFixed(0)}%</span>
+                  <span className="text-xs text-muted-foreground">{stats.cpu.cores} cores</span>
+                </div>
+                <Bar pct={stats.cpu.usagePct} />
+                <p className="truncate text-xs text-muted-foreground" title={stats.cpu.model}>{stats.cpu.model}</p>
+                <div className="grid grid-cols-8 gap-1 pt-1">
+                  {stats.cpu.perCore.map((c, i) => (
+                    <div key={i} className="flex h-10 items-end rounded bg-muted" title={`core ${i}: ${c}%`}>
+                      <div className={`w-full rounded ${barColor(c)}`} style={{ height: `${Math.max(4, c)}%` }} />
+                    </div>
+                  ))}
+                </div>
+              </Card>
+
+              {/* Memory */}
+              <Card title="Memory" icon={MemoryStick}>
+                {stats.mem ? (
+                  <>
+                    <div className="flex items-end justify-between">
+                      <span className="text-3xl font-semibold text-foreground">{stats.mem.usedPct.toFixed(0)}%</span>
+                      <span className="text-xs text-muted-foreground">
+                        {fmtBytes(stats.mem.usedBytes)} / {fmtBytes(stats.mem.totalBytes)}
+                      </span>
+                    </div>
+                    <Bar pct={stats.mem.usedPct} />
+                    {stats.mem.swapTotalBytes > 0 && (
+                      <p className="text-xs text-muted-foreground">
+                        swap {fmtBytes(stats.mem.swapUsedBytes)} / {fmtBytes(stats.mem.swapTotalBytes)}
+                      </p>
+                    )}
+                  </>
+                ) : (
+                  <p className="text-sm text-muted-foreground">unavailable</p>
+                )}
+              </Card>
+
+              {/* Disks */}
+              <Card title="Disks" icon={HardDrive}>
+                {stats.disks.length ? (
+                  <div className="flex flex-col gap-3">
+                    {stats.disks.map((d) => (
+                      <div key={d.mount} className="flex flex-col gap-1">
+                        <div className="flex items-center justify-between text-xs">
+                          <span className="truncate font-mono text-foreground" title={`${d.mount} (${d.fsType})`}>{d.mount}</span>
+                          <span className="text-muted-foreground">{fmtBytes(d.usedBytes)} / {fmtBytes(d.totalBytes)}</span>
+                        </div>
+                        <Bar pct={d.usedPct} />
+                      </div>
+                    ))}
+                  </div>
+                ) : (
+                  <p className="text-sm text-muted-foreground">no disks</p>
+                )}
+              </Card>
+            </div>
+
+            {/* Processes */}
+            <Card title="Top processes" icon={Server}>
+              <div className="overflow-x-auto">
+                <table className="w-full text-left text-sm">
+                  <thead>
+                    <tr className="text-xs uppercase tracking-wide text-muted-foreground">
+                      <th className="pb-2 pr-4 font-medium">PID</th>
+                      <th className="pb-2 pr-4 font-medium">User</th>
+                      <th className="pb-2 pr-4 text-right font-medium">CPU%</th>
+                      <th className="pb-2 pr-4 text-right font-medium">MEM%</th>
+                      <th className="pb-2 font-medium">Command</th>
+                    </tr>
+                  </thead>
+                  <tbody>
+                    {stats.processes.map((p) => (
+                      <tr key={p.pid} className="border-t border-border/60">
+                        <td className="py-1.5 pr-4 font-mono text-muted-foreground">{p.pid}</td>
+                        <td className="py-1.5 pr-4 text-muted-foreground">{p.user}</td>
+                        <td className="py-1.5 pr-4 text-right font-mono text-foreground">{p.cpuPct.toFixed(1)}</td>
+                        <td className="py-1.5 pr-4 text-right font-mono text-muted-foreground">{p.memPct.toFixed(1)}</td>
+                        <td className="max-w-0 truncate py-1.5 font-mono text-foreground" title={p.command}>{p.command}</td>
+                      </tr>
+                    ))}
+                  </tbody>
+                </table>
+              </div>
+            </Card>
+          </>
+        )}
+      </div>
+    </div>
+  );
+};

src/apps/officer-web/Screens/Dashboard/SystemMonitor/index.tsx

@@ -0,0 +1 @@
+export * from './SystemMonitorScreen';

src/apps/officer-web/Screens/Dashboard/index.tsx

@@ -11,6 +11,7 @@ export * from './Tasks';
 
 export * from './Files';
 export * from './Music';
+export * from './SystemMonitor';
 export * from './CodeEditor';
 export * from './ChatHistory';
 export * from './Dashboards';