Fix security issues, breaking changes, and code cleanup for weather satellite PR

Co-authored-by: mitchross <6330506+mitchross@users.noreply.github.com>

utils/weather_sat.py

@@ -185,6 +185,11 @@ class WeatherSatDecoder:
     def current_frequency(self) -> float:
         return self._current_frequency
 
+    @property
+    def device_index(self) -> int:
+        """Return current device index."""
+        return self._device_index
+
     def _detect_decoder(self) -> str | None:
         """Detect which weather satellite decoder is available."""
         if shutil.which('satdump'):