v0.9.0:0 - OpenAI-compatible audio proxy for Open WebUI / Home Assistant

Adds three new endpoints to spark-control that translate OpenAI's
audio API shapes to the Parakeet (STT) and Magpie (TTS, NVIDIA Riva)
services on the Sparks:

  GET  /v1/models                — STT model + Magpie's 60+ voices
  POST /v1/audio/speech          — OpenAI body -> Magpie multipart synthesize
                                    (returns audio/wav passthrough)
  POST /v1/audio/transcriptions  — relay to Parakeet (already compatible)

Verified shapes against the live services:
  - Parakeet returns OpenAI-style {"text": "..."} or verbose_json with
    segments+words. Already a perfect drop-in for OpenAI clients.
  - Magpie returns raw WAV bytes with Content-Type: audio/wav. NOT
    base64-wrapped JSON as one might assume. The proxy is literally a
    body-translation on the request side; response is passthrough.

Voice language is auto-derived from the voice name (e.g.
Magpie-Multilingual.EN-US.Mia -> language=en-US) so clients don't
need to set it explicitly.

Open WebUI / Home Assistant / Recap Relay can now all point at one
URL — https://<spark-control>.local/v1 — and get LLM, STT, TTS
behind a single identity. No shim service to deploy.

Pure addition: no existing routes touched; the dashboard, /api/*,
download flow, deep-health, hardware probes are all unchanged.

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

image/app/server.py

@@ -12,6 +12,7 @@ from typing import Literal
 from .config import Settings
 from .connectivity import get_mac, record_report, record_state, summary as connectivity_summary
 from .custom_services import add_custom_service, delete_custom_service
+from .audio_proxy import build_router as build_audio_router
 from .deep_health import DeepHealth
 from .disk import delete_from_disk, probe_disk
 from .download import DownloadManager
@@ -54,6 +55,11 @@ async def _stop_deep_health() -> None:
 _STATIC_DIR = Path(__file__).resolve().parent / "static"
 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))
+
 
 @app.get("/", include_in_schema=False)
 async def index() -> FileResponse: