Add queue-based media download system with rate limiting

- Add download_status, retry_after, queued_at columns to mls_media table
- Add mls_media_log table for download attempt tracking
- Rewrite media handler to queue downloads instead of immediate download
- Add 700ms delay between downloads (25% buffer over 2/sec limit)
- Add 3-hour backoff for rate-limited (429) responses
- Add max 5 attempts before marking as permanently failed
- Add wp mls media command: status, process, reset, logs
- Deprecate wp mls sync media in favor of wp mls media process
- Update documentation with queue system details and cron examples

Media downloads are now separate from property sync:
1. wp mls sync full/incremental - syncs properties, queues media
2. wp mls media process - downloads queued media with rate limiting

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

wp-content/plugins/mls-by-hansonxyz/mls-by-hansonxyz.php

@@ -22,7 +22,7 @@ define('MLS_PLUGIN_FILE', __FILE__);
 define('MLS_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('MLS_PLUGIN_URL', plugin_dir_url(__FILE__));
 define('MLS_PLUGIN_BASENAME', plugin_basename(__FILE__));
-define('MLS_DB_VERSION', '1.0.0');
+define('MLS_DB_VERSION', '1.1.0');
 
 // Database table names (without prefix)
 define('MLS_TABLE_PROPERTIES', 'mls_properties');
@@ -30,6 +30,7 @@ define('MLS_TABLE_MEDIA', 'mls_media');
 define('MLS_TABLE_SYNC_STATE', 'mls_sync_state');
 define('MLS_TABLE_RATE_LIMITS', 'mls_rate_limits');
 define('MLS_TABLE_SYNC_LOG', 'mls_sync_log');
+define('MLS_TABLE_MEDIA_LOG', 'mls_media_log');
 
 /**
  * Main plugin class