feat(android): implement Phase 1.1 SQLite database sharing with WAL mode

- Add DailyNotificationDatabase.java with three-table schema and WAL configuration
- Add DailyNotificationMigration.java for SharedPreferences to SQLite migration
- Add DailyNotificationDatabaseTest.java with comprehensive unit tests
- Add ConfigureOptions interface with dbPath, storage mode, and TTL settings
- Add configure() method to DailyNotificationPlugin interface
- Update Android plugin with SQLite integration and automatic migration
- Update web implementations to implement new configure() method
- Add phase1-sqlite-usage.ts example demonstrating shared storage configuration

This implements the critical Phase 1.1 gate for shared SQLite storage:
- App and plugin can open the same SQLite file with WAL mode
- Automatic migration from SharedPreferences preserves existing data
- Schema version checking prevents compatibility issues
- Concurrent reads during background writes enabled
- Configuration API supports both shared and tiered storage modes

Files: 8 changed, 1204 insertions(+)

examples/phase1-sqlite-usage.ts

@@ -0,0 +1,121 @@
+/**
+ * Phase 1.1 Usage Example
+ * 
+ * Demonstrates SQLite database sharing configuration and usage
+ * Shows how to configure the plugin for shared storage mode
+ * 
+ * @author Matthew Raymer
+ * @version 1.0.0
+ */
+
+import { DailyNotification } from '@timesafari/daily-notification-plugin';
+
+/**
+ * Example: Configure plugin for shared SQLite storage
+ */
+async function configureSharedStorage() {
+  try {
+    console.log('Configuring plugin for shared SQLite storage...');
+    
+    // Configure the plugin with shared storage mode
+    await DailyNotification.configure({
+      dbPath: '/data/data/com.yourapp/databases/daily_notifications.db',
+      storage: 'shared',
+      ttlSeconds: 3600, // 1 hour TTL
+      prefetchLeadMinutes: 15, // 15 minutes before notification
+      maxNotificationsPerDay: 5,
+      retentionDays: 7
+    });
+    
+    console.log('✅ Plugin configured successfully for shared storage');
+    
+    // Now the plugin will use SQLite database instead of SharedPreferences
+    // The database will be shared between app and plugin
+    // WAL mode enables concurrent reads during writes
+    
+  } catch (error) {
+    console.error('❌ Configuration failed:', error);
+  }
+}
+
+/**
+ * Example: Configure plugin for tiered storage (current implementation)
+ */
+async function configureTieredStorage() {
+  try {
+    console.log('Configuring plugin for tiered storage...');
+    
+    // Configure the plugin with tiered storage mode (default)
+    await DailyNotification.configure({
+      storage: 'tiered',
+      ttlSeconds: 1800, // 30 minutes TTL
+      prefetchLeadMinutes: 10, // 10 minutes before notification
+      maxNotificationsPerDay: 3,
+      retentionDays: 5
+    });
+    
+    console.log('✅ Plugin configured successfully for tiered storage');
+    
+    // Plugin will continue using SharedPreferences + in-memory cache
+    
+  } catch (error) {
+    console.error('❌ Configuration failed:', error);
+  }
+}
+
+/**
+ * Example: Schedule notification with new configuration
+ */
+async function scheduleWithNewConfig() {
+  try {
+    // First configure for shared storage
+    await configureSharedStorage();
+    
+    // Then schedule a notification
+    await DailyNotification.scheduleDailyNotification({
+      url: 'https://api.example.com/daily-content',
+      time: '09:00',
+      title: 'Daily Update',
+      body: 'Your daily notification is ready',
+      sound: true,
+      priority: 'high'
+    });
+    
+    console.log('✅ Notification scheduled with shared storage configuration');
+    
+  } catch (error) {
+    console.error('❌ Scheduling failed:', error);
+  }
+}
+
+/**
+ * Example: Check migration status
+ */
+async function checkMigrationStatus() {
+  try {
+    // Configure for shared storage to trigger migration
+    await DailyNotification.configure({
+      storage: 'shared',
+      dbPath: '/data/data/com.yourapp/databases/daily_notifications.db'
+    });
+    
+    // The plugin will automatically:
+    // 1. Create SQLite database with WAL mode
+    // 2. Migrate existing SharedPreferences data
+    // 3. Validate migration success
+    // 4. Log migration statistics
+    
+    console.log('✅ Migration completed automatically during configuration');
+    
+  } catch (error) {
+    console.error('❌ Migration failed:', error);
+  }
+}
+
+// Export examples for use
+export {
+  configureSharedStorage,
+  configureTieredStorage,
+  scheduleWithNewConfig,
+  checkMigrationStatus
+};