v0.9.0:2 - audio proxy: turn Parakeet wedge 500 into clean 503 + immediate auto-restart

Parakeet's recurring CUDA wedge (CUBLAS_STATUS_*_ERROR mid-attention)
fires reliably on Open WebUI's WebM/Opus->MP3 audio. Previously the
proxy relayed the upstream 500 verbatim, Open WebUI showed "Server
connection error" with no signal to retry, and recovery took up to
5 minutes (waiting for the next periodic deep-health probe).

Now the proxy:
  1. Detects 500 from /v1/audio/transcriptions
  2. Fires deep_health.run_one("parakeet") as a background asyncio task
     (which contains the same wedge-detect + rate-limited auto-restart
     logic, but runs immediately instead of waiting for the next tick)
  3. Returns 503 with a clear detail message and Retry-After: 60

The client (Open WebUI, Home Assistant, etc.) gets a proper retry
signal; the auto-restart triggers inside seconds; the next attempt
~60s later succeeds. Rate-limiting (3 restarts per 30 min) is
inherited from the deep-health module so this can't cause restart
storms.

server.py: pass deep_health into build_audio_router().
audio_proxy.py: new 503-with-restart branch; signature now accepts
                deep_health as an optional dependency.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

image/app/server.py

@@ -58,7 +58,9 @@ app.mount("/static", StaticFiles(directory=_STATIC_DIR), name="static")
 # OpenAI-compatible audio proxy: /v1/audio/speech, /v1/audio/transcriptions, /v1/models.
 # Lets Open WebUI, Home Assistant, and any other OpenAI-shaped client talk to
 # Parakeet (STT) and Magpie (TTS) through a single spark-control URL.
-app.include_router(build_audio_router(settings))
+# Passing deep_health lets the proxy fire an immediate wedge-detect + auto-restart
+# when Parakeet returns 500, instead of waiting up to 5 min for the periodic probe.
+app.include_router(build_audio_router(settings, deep_health=deep_health))
 
 
 @app.get("/", include_in_schema=False)