feat: Enhance Android release signing process with improved key alias resolution and error handling

android/app/build.gradle.kts

@@ -34,7 +34,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId = "com.example.reader_app"
+        applicationId = "dev.fevirtus.reader"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion