feat(compute): Worker-Selbstanmeldung ueber RVS + Flotten-Anzeige (Stage 2)

Jeder GPU-Dienst meldet sich beim Connect mit worker_hello {instanceId,
service, node, gpus, model} und haelt die Registry per periodischem
worker_ping {instanceId, busy} (~10s) frisch. So weiss ARIA, was wo laeuft.

- xtts/{voxtral,whisper,f5tts}/bridge.py + llm-adapter/adapter.py:
  INSTANCE_ID=service@NODE_NAME, _worker_register()-Coroutine (hello + ping),
  busy-Quelle je Worker (aktive STT-Sessions / TTS-Render / in-flight LLM);
  Task sauber gecancelt bei Reconnect.
- bridge/aria_bridge.py: self._workers-Registry + Handler worker_hello/
  worker_ping (spiegelt sat_hello), _worker_list() (35s-Offline-TTL),
  _pick_worker() (Round-Robin freie Instanz, fuer Stage-3-Routing),
  /internal/worker-list-Endpoint.
- diagnostic/server.js: workers-Map, worker_hello/worker_ping-Tracking,
  worker_update-Broadcast + worker_list-Action + on-connect-Snapshot.
- diagnostic/index.html: "Compute-Flotte"-Panel im Satelliten-Tab — pro Node
  gruppiert, mit Dienst/Modell/GPU und frei/beschaeftigt/offline-Status.

Stage 2 von 3. Reine Sichtbarkeit, kein Routing-Verhalten geaendert.

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

diagnostic/index.html

@@ -1307,6 +1307,22 @@
       <div class="card">
         <div id="sat-list" style="font-size:12px;color:#8888AA;">(Lade...)</div>
       </div>
+
+      <div style="display:flex;justify-content:space-between;align-items:center;margin:16px 0 8px;">
+        <h2 style="margin:0;">Compute-Flotte 🖥️</h2>
+        <button class="btn secondary" onclick="requestWorkers()" style="padding:4px 10px;font-size:11px;">Aktualisieren</button>
+      </div>
+      <div class="card" style="margin-bottom:8px;">
+        <p style="color:#8888AA;font-size:12px;margin:0;">
+          GPU-Dienste (STT / TTS / lokales LLM), verteilt auf einen oder mehrere
+          Nodes. Jeder Node startet per <code>COMPOSE_PROFILES</code> nur die
+          Dienste, die er anbietet. Hier siehst Du, welche Instanz auf welchem
+          Node laeuft, mit welchem Modell/GPU und ob sie gerade beschaeftigt ist.
+        </p>
+      </div>
+      <div class="card">
+        <div id="worker-list" style="font-size:12px;color:#8888AA;">(Lade...)</div>
+      </div>
     </div>
   </div><!-- /tab-satellites -->
 
@@ -1958,6 +1974,7 @@
         }
 
         if (msg.type === 'sat_update') { satellites = msg.satellites || []; renderSatellites(); return; }
+        if (msg.type === 'worker_update') { workers = msg.workers || []; renderWorkers(); return; }
         if (msg.type === 'sat_devices') {
           if (msg.satellite) { satDevices[msg.satellite] = { devices: msg.devices || [], location: msg.location, ts: Date.now() }; }
           satScanning = null;
@@ -4179,9 +4196,50 @@
         loadTriggers();
       } else if (tab === 'satellites') {
         requestSatellites();
+        requestWorkers();
       }
     }
 
+    // ── Compute-Flotte ─────────────────────────────────────
+    let workers = [];   // [{instanceId, service, node, gpus, model, busy, online}]
+    const WORKER_SVC_META = {
+      voxtral: { icon: '🎙️', label: 'STT (Voxtral)' },
+      whisper: { icon: '🎙️', label: 'STT (Whisper)' },
+      f5tts:   { icon: '🔊', label: 'TTS (F5-TTS)' },
+      llm:     { icon: '🧠', label: 'LLM (lokal)' },
+    };
+    function requestWorkers() { send({ action: 'worker_list' }); }
+    function renderWorkers() {
+      const box = document.getElementById('worker-list');
+      if (!box) return;
+      if (!workers.length) {
+        box.innerHTML = '<span style="color:#8888AA;">Kein Compute-Node verbunden. ' +
+          'Starte auf einem GPU-Rechner <code>cd xtts &amp;&amp; docker compose up -d</code> ' +
+          '(mit gesetztem <code>COMPOSE_PROFILES</code>).</span>';
+        return;
+      }
+      // Nach Node gruppieren.
+      const byNode = {};
+      for (const w of workers) { (byNode[w.node || '?'] = byNode[w.node || '?'] || []).push(w); }
+      box.innerHTML = Object.keys(byNode).sort().map(node => {
+        const rows = byNode[node].map(w => {
+          const meta = WORKER_SVC_META[w.service] || { icon: '⚙️', label: w.service };
+          const dot = !w.online ? '#666' : (w.busy ? '#FFB020' : '#3FFF3F');
+          const stat = !w.online ? 'offline' : (w.busy ? 'beschaeftigt' : 'frei');
+          return '<div style="display:flex;align-items:center;gap:8px;padding:4px 0;">' +
+            '<span style="width:8px;height:8px;border-radius:50%;background:' + dot + ';display:inline-block;"></span>' +
+            '<span>' + meta.icon + ' <b>' + escapeHtml(meta.label) + '</b></span>' +
+            '<span style="color:#8888AA;">' + escapeHtml(w.model || '') + '</span>' +
+            (w.gpus ? '<span style="color:#8888AA;">GPU ' + escapeHtml(w.gpus) + '</span>' : '') +
+            '<span style="margin-left:auto;color:' + dot + ';">' + stat + '</span>' +
+            '</div>';
+        }).join('');
+        return '<div style="margin-bottom:10px;">' +
+          '<div style="font-weight:600;color:#AAB;margin-bottom:2px;">🖥️ ' + escapeHtml(node) + '</div>' +
+          rows + '</div>';
+      }).join('');
+    }
+
     // ── Satelliten-Ansicht ─────────────────────────────────
     let satellites = [];            // [{id, location, caps, control, online}]
     let satDevices = {};            // id → {devices, location, ts}