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/daily-notification-test/scripts/fix-capacitor-plugins.js

@@ -5,10 +5,10 @@
  * 
  * Fixes:
  * 1. capacitor.plugins.json - Ensures DailyNotification plugin is registered
- * 2. capacitor.settings.gradle - Corrects plugin path from android/ to android/plugin/
+ * 2. capacitor.settings.gradle - Verifies plugin path points to android/ (standard structure)
  * 
  * This script should run automatically after 'npx cap sync android'
- * to fix issues with Capacitor's auto-generated files.
+ * to verify Capacitor's auto-generated files are correct.
  * 
  * @author Matthew Raymer
  */
@@ -60,10 +60,10 @@ function fixCapacitorPlugins() {
 }
 
 /**
- * Fix capacitor.settings.gradle to point to android/plugin/ instead of android/
+ * Fix capacitor.settings.gradle to verify plugin path points to android/ (standard structure)
  */
 function fixCapacitorSettingsGradle() {
-  console.log('🔧 Fixing capacitor.settings.gradle...');
+  console.log('🔧 Verifying capacitor.settings.gradle...');
   
   if (!fs.existsSync(SETTINGS_GRADLE_PATH)) {
     console.log('ℹ️  capacitor.settings.gradle not found (may not be a test-app)');
@@ -74,30 +74,31 @@ function fixCapacitorSettingsGradle() {
     let content = fs.readFileSync(SETTINGS_GRADLE_PATH, 'utf8');
     const originalContent = content;
     
-    // Check if the path already points to android/plugin
-    if (content.includes('android/plugin')) {
-      console.log('✅ capacitor.settings.gradle already has correct path (android/plugin)');
-      return;
-    }
+    // Check if the path correctly points to android/ (standard structure)
+    const correctPath = "project(':timesafari-daily-notification-plugin').projectDir = new File('../node_modules/@timesafari/daily-notification-plugin/android')";
+    const oldPluginPath = "project(':timesafari-daily-notification-plugin').projectDir = new File('../node_modules/@timesafari/daily-notification-plugin/android/plugin')";
     
-    // Check if we need to fix the path (points to android but should be android/plugin)
-    if (content.includes("project(':timesafari-daily-notification-plugin').projectDir = new File('../node_modules/@timesafari/daily-notification-plugin/android')")) {
-      // Replace the path
+    // Check if it's using the old android/plugin/ path (needs fixing)
+    if (content.includes('android/plugin')) {
+      console.log('⚠️  capacitor.settings.gradle uses old path (android/plugin/) - fixing to standard structure');
       content = content.replace(
-        "project(':timesafari-daily-notification-plugin').projectDir = new File('../node_modules/@timesafari/daily-notification-plugin/android')",
-        `// NOTE: Plugin module is in android/plugin/ subdirectory, not android root
-// This file is auto-generated by Capacitor, but must be manually corrected for this plugin structure
-project(':timesafari-daily-notification-plugin').projectDir = new File('../node_modules/@timesafari/daily-notification-plugin/android/plugin')`
+        oldPluginPath,
+        `// Plugin uses standard Capacitor structure: android/ (not android/plugin/)
+${correctPath}`
       );
       
-      fs.writeFileSync(SETTINGS_GRADLE_PATH, content);
-      console.log('✅ Fixed plugin path in capacitor.settings.gradle (android -> android/plugin)');
+      if (content !== originalContent) {
+        fs.writeFileSync(SETTINGS_GRADLE_PATH, content);
+        console.log('✅ Fixed plugin path in capacitor.settings.gradle (android/plugin -> android)');
+      }
+    } else if (content.includes(correctPath) || content.includes("android')")) {
+      console.log('✅ capacitor.settings.gradle has correct path (android/)');
     } else {
       console.log('ℹ️  capacitor.settings.gradle doesn\'t reference the plugin or uses a different structure');
     }
     
   } catch (error) {
-    console.error('❌ Error fixing capacitor.settings.gradle:', error.message);
+    console.error('❌ Error verifying capacitor.settings.gradle:', error.message);
     process.exit(1);
   }
 }