feat(diagnostic): Host-Agenten in der Satelliten-Flotte anzeigen (Phase E)

Diagnostic-Server trackt host_hello/host_ping (hosts-Map), broadcastet
host_update und beantwortet die host_list-Action. UI: neues Panel
"Host-Agenten" im Satelliten-Tab — zeigt Name/OS/Caps/online + ob
CONTROL_ENABLED. Reine Sichtbarkeit; Steuerung laeuft ueber ARIA.

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

diagnostic/server.js

@@ -550,6 +550,21 @@ function broadcastSatellites() {
   broadcast({ type: "sat_update", satellites: satelliteList() });
 }
 
+// ── Host-Agenten: Direktzugriff auf einen Rechner ────────────────
+const hosts = new Map(); // hostId → {hostId, name, os, caps, control, last_seen}
+
+function hostList() {
+  const now = Date.now();
+  return Array.from(hosts.values()).map(h => ({
+    hostId: h.hostId, name: h.name, os: h.os, caps: h.caps, control: h.control,
+    online: (now - (h.last_seen || 0)) < 300000,
+  }));
+}
+
+function broadcastHosts() {
+  broadcast({ type: "host_update", hosts: hostList() });
+}
+
 // ── Compute-Fleet: GPU-Worker (voxtral/whisper/f5tts/llm) ──────────
 // Worker melden sich per worker_hello + halten sich per worker_ping (busy) frisch.
 const workers = new Map(); // instanceId → {instanceId, service, node, gpus, model, busy, last_seen}
@@ -1065,6 +1080,21 @@ function connectRVS(forcePlain) {
           });
           broadcastSatellites();
         }
+      } else if (msg.type === "host_hello") {
+        // Ein Host-Agent (Direktzugriff auf einen Rechner) meldet sich.
+        const p = msg.payload || {};
+        if (p.hostId) {
+          const wasKnown = hosts.has(p.hostId);
+          hosts.set(p.hostId, {
+            hostId: p.hostId, name: p.name || p.hostId, os: p.os || "",
+            caps: p.caps || [], control: !!p.control, last_seen: Date.now(),
+          });
+          if (!wasKnown) broadcastHosts();
+          else hosts.get(p.hostId).last_seen = Date.now();
+        }
+      } else if (msg.type === "host_ping") {
+        const p = msg.payload || {};
+        if (p.hostId && hosts.has(p.hostId)) hosts.get(p.hostId).last_seen = Date.now();
       } else if (msg.type === "sat_devices") {
         // Antwort eines Satelliten auf sat_discover → Geraeteliste an Browser.
         const p = msg.payload || {};
@@ -2721,6 +2751,8 @@ wss.on("connection", (ws) => {
   if (currentDiskStatus) ws.send(JSON.stringify(currentDiskStatus));
   // Aktuell bekannte Satelliten mitgeben (RVS replayt sat_hello nicht).
   ws.send(JSON.stringify({ type: "sat_update", satellites: satelliteList() }));
+  // Aktuell bekannte Host-Agenten mitgeben.
+  ws.send(JSON.stringify({ type: "host_update", hosts: hostList() }));
   // Aktuell bekannte Compute-Worker mitgeben (RVS replayt worker_hello nicht).
   ws.send(JSON.stringify({ type: "worker_update", workers: workerList() }));
 
@@ -2754,6 +2786,9 @@ wss.on("connection", (ws) => {
       } else if (msg.action === "sat_list") {
         // Browser will die aktuelle Satelliten-Liste.
         ws.send(JSON.stringify({ type: "sat_update", satellites: satelliteList() }));
+      } else if (msg.action === "host_list") {
+        // Browser will die aktuelle Host-Agenten-Liste.
+        ws.send(JSON.stringify({ type: "host_update", hosts: hostList() }));
       } else if (msg.action === "worker_list") {
         // Browser will die aktuelle Compute-Flotte.
         ws.send(JSON.stringify({ type: "worker_update", workers: workerList() }));