fix: Add missing field removals for dao, itemname, and coordinate conversion

Production logs showed additional fields causing insertion failures:
- dao: DAO extension data
- itemname: Item name field
- longitude/latitude: Parser uses these but our schema uses lon/lat

Added conversion step to map latitude->lat and longitude->lon before processing.
This ensures packets can be properly saved to the database.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/aprsme/packet_consumer.ex

@@ -308,6 +308,7 @@ defmodule Aprsme.PacketConsumer do
 
     # Apply the same processing as the original store_packet function
     attrs
+    |> convert_coordinate_field_names()
     |> normalize_packet_attrs()
     |> set_received_at()
     |> patch_lat_lon_from_data_extended()
@@ -383,6 +384,15 @@ defmodule Aprsme.PacketConsumer do
     |> Map.delete("gpsfixstatus")
     |> Map.delete(:raw_weather_data)
     |> Map.delete("raw_weather_data")
+    # Additional fields found in production logs
+    |> Map.delete(:dao)
+    |> Map.delete("dao")
+    |> Map.delete(:longitude)
+    |> Map.delete("longitude")
+    |> Map.delete(:latitude)
+    |> Map.delete("latitude")
+    |> Map.delete(:itemname)
+    |> Map.delete("itemname")
   end
 
   # Helper functions for coordinate validation and point creation
@@ -414,6 +424,23 @@ defmodule Aprsme.PacketConsumer do
   defp valid_packet?(%{sender: sender}) when is_binary(sender) and byte_size(sender) > 0, do: true
   defp valid_packet?(_), do: false
 
+  # Convert latitude/longitude to lat/lon if present at top level
+  defp convert_coordinate_field_names(attrs) do
+    attrs
+    |> then(fn a ->
+      case Map.get(a, :latitude) do
+        nil -> a
+        lat -> a |> Map.put(:lat, lat) |> Map.delete(:latitude)
+      end
+    end)
+    |> then(fn a ->
+      case Map.get(a, :longitude) do
+        nil -> a
+        lon -> a |> Map.put(:lon, lon) |> Map.delete(:longitude)
+      end
+    end)
+  end
+
   # Helper functions copied from Packets module for consistency
   defp normalize_packet_attrs(attrs) do
     attrs