Always have Public channel available

app/routers/channels.py

@@ -7,6 +7,7 @@ from pydantic import BaseModel, Field
 
 from app.dependencies import require_connected
 from app.models import Channel
+from app.radio_sync import ensure_default_channels
 from app.repository import ChannelRepository
 
 logger = logging.getLogger(__name__)
@@ -24,6 +25,8 @@ class CreateChannelRequest(BaseModel):
 @router.get("", response_model=list[Channel])
 async def list_channels() -> list[Channel]:
     """List all channels from the database."""
+    # Ensure Public channel always exists (self-healing)
+    await ensure_default_channels()
     return await ChannelRepository.get_all()