refactor(android)!: restructure to standard Capacitor plugin layout

Restructure Android project from nested module layout to standard
Capacitor plugin structure following community conventions.

Structure Changes:
- Move plugin code from android/plugin/ to android/src/main/java/
- Move test app from android/app/ to test-apps/android-test-app/app/
- Remove nested android/plugin module structure
- Remove nested android/app test app structure

Build Infrastructure:
- Add Gradle wrapper files (gradlew, gradlew.bat, gradle/wrapper/)
- Transform android/build.gradle from root project to library module
- Update android/settings.gradle for standalone plugin builds
- Add android/gradle.properties with AndroidX configuration
- Add android/consumer-rules.pro for ProGuard rules

Configuration Updates:
- Add prepare script to package.json for automatic builds on npm install
- Update package.json version to 1.0.1
- Update android/build.gradle to properly resolve Capacitor dependencies
- Update test-apps/android-test-app/settings.gradle with correct paths
- Remove android/variables.gradle (hardcode values in build.gradle)

Documentation:
- Update BUILDING.md with new structure and build process
- Update INTEGRATION_GUIDE.md to reflect standard structure
- Update README.md to remove path fix warnings
- Add test-apps/BUILD_PROCESS.md documenting test app build flows

Test App Configuration:
- Fix android-test-app to correctly reference plugin and Capacitor
- Remove capacitor-cordova-android-plugins dependency (not needed)
- Update capacitor.settings.gradle path verification in fix script

BREAKING CHANGE: Plugin now uses standard Capacitor Android structure.
Consuming apps must update their capacitor.settings.gradle to reference
android/ instead of android/plugin/. This is automatically handled by
Capacitor CLI for apps using standard plugin installation.

test-apps/android-test-app/app/proguard-rules.pro

@@ -0,0 +1,154 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
+
+# =============================================================================
+# Capacitor Plugin Protection Rules
+# =============================================================================
+
+# Keep Capacitor Plugin annotations & your plugin facade
+-keep class com.getcapacitor.** { *; }
+-keep @com.getcapacitor.annotation.CapacitorPlugin class * { *; }
+-keepclassmembers class ** {
+  @com.getcapacitor.annotation.PluginMethod *;
+}
+
+# Keep DailyNotification plugin classes
+-keep class com.timesafari.dailynotification.** { *; }
+
+# Keep plugin method names and signatures
+-keepclassmembers class com.timesafari.dailynotification.DailyNotificationPlugin {
+  public *;
+}
+
+# Keep all plugin manager classes
+-keep class com.timesafari.dailynotification.*Manager { *; }
+-keep class com.timesafari.dailynotification.*Storage { *; }
+-keep class com.timesafari.dailynotification.*Receiver { *; }
+
+# Keep Room database classes
+-keep class com.timesafari.dailynotification.storage.** { *; }
+-keep class com.timesafari.dailynotification.database.** { *; }
+
+# Keep error handling classes
+-keep class com.timesafari.dailynotification.*Error* { *; }
+-keep class com.timesafari.dailynotification.*Exception* { *; }
+
+# Keep JWT and ETag managers
+-keep class com.timesafari.dailynotification.*JWT* { *; }
+-keep class com.timesafari.dailynotification.*ETag* { *; }
+
+# Keep performance and optimization classes
+-keep class com.timesafari.dailynotification.*Performance* { *; }
+-keep class com.timesafari.dailynotification.*Optimizer* { *; }
+
+# Keep rolling window and TTL classes
+-keep class com.timesafari.dailynotification.*Rolling* { *; }
+-keep class com.timesafari.dailynotification.*TTL* { *; }
+
+# Keep exact alarm and reboot recovery classes
+-keep class com.timesafari.dailynotification.*Exact* { *; }
+-keep class com.timesafari.dailynotification.*Reboot* { *; }
+-keep class com.timesafari.dailynotification.*Recovery* { *; }
+
+# Keep enhanced fetcher classes
+-keep class com.timesafari.dailynotification.*Enhanced* { *; }
+-keep class com.timesafari.dailynotification.*Fetcher* { *; }
+
+# Keep migration classes
+-keep class com.timesafari.dailynotification.*Migration* { *; }
+
+# Keep channel manager
+-keep class com.timesafari.dailynotification.ChannelManager { *; }
+
+# Keep permission manager
+-keep class com.timesafari.dailynotification.PermissionManager { *; }
+
+# Keep scheduler classes
+-keep class com.timesafari.dailynotification.*Scheduler* { *; }
+
+# =============================================================================
+# Android System Classes
+# =============================================================================
+
+# Keep Android system classes used by the plugin
+-keep class android.app.AlarmManager { *; }
+-keep class android.app.NotificationManager { *; }
+-keep class android.app.NotificationChannel { *; }
+-keep class android.app.PendingIntent { *; }
+-keep class androidx.work.WorkManager { *; }
+-keep class androidx.core.app.NotificationCompat { *; }
+
+# Keep broadcast receiver classes
+-keep class android.content.BroadcastReceiver { *; }
+-keep class android.content.Intent { *; }
+
+# =============================================================================
+# Room Database Protection
+# =============================================================================
+
+# Keep Room database classes
+-keep class androidx.room.** { *; }
+-keep class * extends androidx.room.RoomDatabase { *; }
+-keep @androidx.room.Entity class * { *; }
+-keep @androidx.room.Dao class * { *; }
+
+# Keep Room database migrations
+-keep class * extends androidx.room.migration.Migration { *; }
+
+# =============================================================================
+# Gson Protection (if used)
+# =============================================================================
+
+# Keep Gson classes if used for JSON serialization
+-keep class com.google.gson.** { *; }
+-keep class * implements com.google.gson.TypeAdapterFactory { *; }
+-keep class * implements com.google.gson.JsonSerializer { *; }
+-keep class * implements com.google.gson.JsonDeserializer { *; }
+
+# =============================================================================
+# Debugging and Development
+# =============================================================================
+
+# Keep debug information for development builds
+-keepattributes SourceFile,LineNumberTable
+-keepattributes Signature
+-keepattributes Exceptions
+-keepattributes InnerClasses
+-keepattributes EnclosingMethod
+
+# Keep generic signatures for reflection
+-keepattributes Signature
+
+# Keep annotations
+-keepattributes *Annotation*
+
+# =============================================================================
+# Network and Security
+# =============================================================================
+
+# Keep network-related classes
+-keep class java.net.** { *; }
+-keep class javax.net.ssl.** { *; }
+
+# Keep security-related classes
+-keep class java.security.** { *; }
+-keep class javax.crypto.** { *; }