feat(ios): preparar soporte iOS

- app.json: bundleIdentifier + buildNumber para iOS
- eas.json: perfiles iOS (development con simulador, preview ipa, production)
  y appleId para submit
- app.config.js: inyección de GOOGLE_MAPS_IOS_KEY (opcional; por defecto
  la app usa Apple Maps en iOS sin necesitar key)
- FeatureMap: MAP_PROVIDER = PROVIDER_GOOGLE en Android, PROVIDER_DEFAULT
  (Apple Maps) en iOS; elimina dependencia de Google Maps key en iOS

Pendiente: generar /ios con 'npx expo prebuild --platform ios' desde macOS.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ui/FeatureMap.tsx

@@ -7,8 +7,12 @@
  */
 import * as Location from 'expo-location';
 import React, { useMemo, useRef } from 'react';
-import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
-import MapView, { Marker, Polygon, Polyline, PROVIDER_GOOGLE } from 'react-native-maps';
+import { Platform, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
+import MapView, { Marker, Polygon, Polyline, PROVIDER_DEFAULT, PROVIDER_GOOGLE } from 'react-native-maps';
+
+// Android usa Google Maps (requiere GOOGLE_MAPS_API_KEY).
+// iOS usa Apple Maps por defecto (sin key, PROVIDER_DEFAULT).
+const MAP_PROVIDER = Platform.OS === 'android' ? PROVIDER_GOOGLE : PROVIDER_DEFAULT;
 import { Feature } from '../api/types';
 import { COLORS } from './components';
 import { geometryToShapes, LatLng, regionFor } from './geojson';
@@ -70,7 +74,7 @@ export function FeatureMap({
       <MapView
         ref={mapRef}
         style={StyleSheet.absoluteFill}
-        provider={PROVIDER_GOOGLE}
+        provider={MAP_PROVIDER}
         initialRegion={region}
         showsUserLocation
       >