fix: crash al arrancar + icono correcto

- MainActivity movida de es.freetimelab.el_impostor → es.freetimelab.farolero
- minSdk forzado a 24 (requerido por nearby_connections)
- Iconos regenerados con PIL (AAPT-compatible)
- Adaptive icon con foreground/background
- Feature graphic actualizado
- Refs a elimpostor limpiadas en servicio_nearby

android/app/build.gradle.kts

@@ -20,7 +20,7 @@ android {
 
     defaultConfig {
         applicationId = "es.freetimelab.farolero"
-        minSdk = flutter.minSdkVersion
+        minSdk = 24
         targetSdk = 34
         versionCode = flutter.versionCode
         versionName = flutter.versionName