feat: ping through agent — send ICMP ping from workstation via agent

Adds a ping tool in the Equipment page workstation card (visible when
agent is online). User enters an IP/hostname, the request goes through
the PMS backend → WebSocket → agent → executes ping -n 4, returns
raw output displayed in a monospace block.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/pages/EquipmentPage.tsx

@@ -599,6 +599,9 @@ function WorkstationCard({
   const [updateMsg, setUpdateMsg]         = useState<string | null>(null)
   const [testResults, setTestResults]     = useState<Record<string, { ok: boolean; msg: string } | null>>({})
   const [testingDeviceId, setTestingDeviceId] = useState<string | null>(null)
+  const [pingHost, setPingHost]           = useState('')
+  const [pinging, setPinging]             = useState(false)
+  const [pingResult, setPingResult]       = useState<{ ok: boolean; output?: string; error?: string } | null>(null)
 
   const hasUpdate = !!(
     ws.isOnline &&
@@ -676,6 +679,20 @@ function WorkstationCard({
     }
   }
 
+  const pingNow = async () => {
+    if (!pingHost.trim() || pinging) return
+    setPinging(true)
+    setPingResult(null)
+    try {
+      const r = await api.workstations.ping(slug, ws.id, pingHost.trim())
+      setPingResult(r)
+    } catch (err) {
+      setPingResult({ ok: false, error: err instanceof Error ? err.message : 'Ошибка' })
+    } finally {
+      setPinging(false)
+    }
+  }
+
   const devices = ws.devices ?? []
 
   return (
@@ -905,6 +922,44 @@ function WorkstationCard({
                 Добавить устройство
               </button>
             )}
+
+            {/* Ping tool — only when agent is online */}
+            {ws.isOnline && (
+              <div className="pt-2 border-t border-slate-100 dark:border-slate-700">
+                <p className="text-xs text-slate-400 dark:text-slate-500 mb-2">Пинг через агента</p>
+                <div className="flex gap-2">
+                  <input
+                    value={pingHost}
+                    onChange={e => setPingHost(e.target.value)}
+                    onKeyDown={e => e.key === 'Enter' && pingNow()}
+                    placeholder="192.168.1.1 или hostname"
+                    className="input text-sm font-mono flex-1 py-1.5"
+                  />
+                  <button
+                    onClick={pingNow}
+                    disabled={pinging || !pingHost.trim()}
+                    className="btn-secondary py-1.5 px-3 text-sm flex items-center gap-1.5 shrink-0 h-9 whitespace-nowrap"
+                  >
+                    {pinging ? <RefreshCw size={13} className="animate-spin" /> : <Network size={13} />}
+                    {pinging ? 'Пинг...' : 'Пинг'}
+                  </button>
+                </div>
+                {pingResult && (
+                  <div className={cn(
+                    'mt-2 rounded-lg text-xs',
+                    pingResult.ok
+                      ? 'bg-emerald-50 dark:bg-emerald-900/20 text-emerald-700 dark:text-emerald-400'
+                      : 'bg-red-50 dark:bg-red-900/20 text-red-700 dark:text-red-400',
+                  )}>
+                    {pingResult.ok && pingResult.output ? (
+                      <pre className="p-3 whitespace-pre-wrap font-mono text-xs overflow-x-auto">{pingResult.output.trim()}</pre>
+                    ) : (
+                      <p className="p-3 flex items-center gap-1.5"><X size={11} />{pingResult.error ?? 'Ошибка'}</p>
+                    )}
+                  </div>
+                )}
+              </div>
+            )}
           </div>
         )}
       </div>