remove radio dependency fallback shim

app/dependencies.py

@@ -1,21 +1,8 @@
 """Shared dependencies for FastAPI routers."""
 
-from fastapi import HTTPException
-
-from app.services.radio_runtime import RadioRuntime
 from app.services.radio_runtime import radio_runtime as radio_manager
 
 
 def require_connected():
-    """Dependency that ensures radio is connected and returns meshcore instance.
-
-    Raises HTTPException 503 if radio is not connected.
-    """
-    if isinstance(radio_manager, RadioRuntime):
-        return radio_manager.require_connected()
-    if getattr(radio_manager, "is_setup_in_progress", False) is True:
-        raise HTTPException(status_code=503, detail="Radio is initializing")
-    mc = getattr(radio_manager, "meshcore", None)
-    if not getattr(radio_manager, "is_connected", False) or mc is None:
-        raise HTTPException(status_code=503, detail="Radio not connected")
-    return mc
+    """Dependency that ensures radio is connected and returns meshcore instance."""
+    return radio_manager.require_connected()