Add mobile app infrastructure and Gitea auto-update support

This commit adds comprehensive mobile app support to enable a native Android app that won't timeout or sleep when the screen goes dark.

New Features:
- JWT-based authentication system (no WordPress session dependency)
- REST API endpoints for mobile app (agent status, queue management, call control)
- Server-Sent Events (SSE) for real-time updates to mobile app
- Firebase Cloud Messaging (FCM) integration for push notifications
- Gitea-based automatic plugin updates
- Mobile app admin settings page

New Files:
- includes/class-twp-mobile-auth.php - JWT authentication with login/refresh/logout
- includes/class-twp-mobile-api.php - REST API endpoints under /twilio-mobile/v1
- includes/class-twp-mobile-sse.php - Real-time event streaming
- includes/class-twp-fcm.php - Push notification handling
- includes/class-twp-auto-updater.php - Gitea-based auto-updates
- admin/mobile-app-settings.php - Admin configuration page

Modified Files:
- includes/class-twp-activator.php - Added twp_mobile_sessions table
- includes/class-twp-core.php - Load and initialize mobile classes
- admin/class-twp-admin.php - Added Mobile App menu item and settings page

Database Changes:
- New table: twp_mobile_sessions (stores JWT refresh tokens and FCM tokens)

API Endpoints:
- POST /twilio-mobile/v1/auth/login
- POST /twilio-mobile/v1/auth/refresh
- POST /twilio-mobile/v1/auth/logout
- GET/POST /twilio-mobile/v1/agent/status
- GET /twilio-mobile/v1/queues/state
- POST /twilio-mobile/v1/calls/{call_sid}/accept
- GET /twilio-mobile/v1/stream/events (SSE)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

includes/class-twp-activator.php

@@ -52,7 +52,8 @@ class TWP_Activator {
             'twp_callbacks',
             'twp_call_recordings',
             'twp_user_extensions',
-            'twp_queue_assignments'
+            'twp_queue_assignments',
+            'twp_mobile_sessions'
         );
         
         $missing_tables = array();
@@ -361,7 +362,25 @@ class TWP_Activator {
             KEY agent_id (agent_id),
             KEY started_at (started_at)
         ) $charset_collate;";
-        
+
+        // Mobile sessions table
+        $table_mobile_sessions = $wpdb->prefix . 'twp_mobile_sessions';
+        $sql_mobile_sessions = "CREATE TABLE $table_mobile_sessions (
+            id int(11) NOT NULL AUTO_INCREMENT,
+            user_id bigint(20) NOT NULL,
+            refresh_token varchar(500) NOT NULL,
+            fcm_token text,
+            device_info text,
+            created_at datetime DEFAULT CURRENT_TIMESTAMP,
+            expires_at datetime NOT NULL,
+            last_used datetime DEFAULT CURRENT_TIMESTAMP,
+            is_active tinyint(1) DEFAULT 1,
+            PRIMARY KEY (id),
+            KEY user_id (user_id),
+            KEY is_active (is_active),
+            KEY expires_at (expires_at)
+        ) $charset_collate;";
+
         dbDelta($sql_schedules);
         dbDelta($sql_queues);
         dbDelta($sql_queued_calls);
@@ -377,7 +396,8 @@ class TWP_Activator {
         dbDelta($sql_recordings);
         dbDelta($sql_user_extensions);
         dbDelta($sql_queue_assignments);
-        
+        dbDelta($sql_mobile_sessions);
+
         // Add missing columns for existing installations
         self::add_missing_columns();
     }