Add runtime script management with Home Assistant integration

Features:
- Runtime script CRUD operations (create, update, delete)
- Thread-safe ConfigManager for YAML updates
- WebSocket notifications for script changes
- Web UI script management interface with full CRUD
- Home Assistant auto-reload on script changes
- Client-side position interpolation for smooth playback
- Include command field in script list API response

Technical improvements:
- Added broadcast_scripts_changed() to WebSocket manager
- Enhanced HA integration to handle scripts_changed messages
- Implemented smooth position updates in Web UI (100ms interval)
- Thread-safe configuration updates with file locking

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

media_server/routes/audio.py

@@ -0,0 +1,28 @@
+"""Audio device API endpoints."""
+
+import logging
+
+from fastapi import APIRouter, Depends
+
+from ..auth import verify_token
+from ..services import get_audio_devices
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/api/audio", tags=["audio"])
+
+
+@router.get("/devices")
+async def list_audio_devices(_: str = Depends(verify_token)) -> list[dict[str, str]]:
+    """List available audio output devices.
+
+    Returns a list of audio devices with their IDs and friendly names.
+    Use the device name in the `audio_device` config option to control
+    a specific device instead of the default one.
+
+    Returns:
+        List of audio devices with id and name
+    """
+    devices = get_audio_devices()
+    logger.debug("Found %d audio devices", len(devices))
+    return devices