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>

xtts/whisper/bridge.py

@@ -59,6 +59,14 @@ WHISPER_DEVICE = os.getenv("WHISPER_DEVICE", "cuda")
 WHISPER_COMPUTE_TYPE = os.getenv("WHISPER_COMPUTE_TYPE", "float16")
 WHISPER_LANGUAGE = os.getenv("WHISPER_LANGUAGE", "de")
 
+# ── Compute-Fleet: Worker-Identitaet & Registrierung ──────────────
+# Meldet sich bei der aria-bridge (worker_hello) + periodischer worker_ping.
+NODE_NAME = os.getenv("NODE_NAME", "node").strip() or "node"
+GPU_IDS = os.getenv("NVIDIA_VISIBLE_DEVICES", "").strip()
+WORKER_SERVICE = "whisper"
+INSTANCE_ID = f"{WORKER_SERVICE}@{NODE_NAME}"
+WORKER_PING_INTERVAL_S = int(os.getenv("WORKER_PING_INTERVAL_S", "10"))
+
 ALLOWED_MODELS = {"tiny", "base", "small", "medium", "large-v3"}
 
 # Streaming-Parameter (Defaults — koennen pro Session vom App-Payload ueberschrieben werden)
@@ -822,6 +830,24 @@ async def _broadcast_status(ws, state: str, **extra) -> None:
     await _send(ws, "service_status", payload)
 
 
+async def _worker_register(ws, *, model: str = "", busy_fn=None) -> None:
+    """Meldet diesen Worker bei der aria-bridge an (worker_hello) und haelt die
+    Flotten-Registry per periodischem worker_ping (mit busy-Status) frisch."""
+    try:
+        await _send(ws, "worker_hello", {
+            "instanceId": INSTANCE_ID, "service": WORKER_SERVICE,
+            "node": NODE_NAME, "gpus": GPU_IDS, "model": model,
+        })
+        while True:
+            await asyncio.sleep(WORKER_PING_INTERVAL_S)
+            busy = bool(busy_fn()) if busy_fn else False
+            await _send(ws, "worker_ping", {"instanceId": INSTANCE_ID, "busy": busy})
+    except asyncio.CancelledError:
+        raise
+    except Exception:
+        return   # Socket tot → still beenden; run_loop reconnectet + startet neu
+
+
 # ──────────────────────────────────────────────────────────────
 #  WS-LOOP
 # ──────────────────────────────────────────────────────────────
@@ -862,6 +888,9 @@ async def run_loop(runner: WhisperRunner, sessions: SessionManager) -> None:
                     except Exception as e:
                         logger.exception("Initial-Handshake crashed: %s", e)
                 asyncio.create_task(_initial_handshake())
+                ping_task = asyncio.create_task(_worker_register(
+                    ws, model=(runner.model_size or WHISPER_MODEL),
+                    busy_fn=lambda: bool(sessions._sessions)))
 
                 async for raw in ws:
                     try:
@@ -1038,6 +1067,10 @@ async def run_loop(runner: WhisperRunner, sessions: SessionManager) -> None:
         except Exception as e:
             logger.warning("Verbindung verloren: %s", e)
             sessions.detach_ws()
+            try:
+                ping_task.cancel()
+            except NameError:
+                pass
             if use_tls and RVS_TLS_FALLBACK and not tls_fallback_tried:
                 logger.info("TLS-Verbindung fehlgeschlagen — Fallback auf ws://")
                 use_tls = False