Add AI writing assistant plugin with local backend, brave search, and image generation support

- Implement local backend AI provider with Ollama integration
- Add Brave Search API integration for real-time search suggestions
- Add image generation manager with multiple AI providers
- Create hybrid provider system with local/cloud fallback
- Add comprehensive settings UI with provider management
- Implement Gutenberg sidebar with writing assistance controls
- Add SEO schema generation for AI-generated content
- Multiple provider support: OpenRouter, local backend, Codex

includes/class-admin-columns.php

@@ -59,7 +59,7 @@ class WP_Agentic_Writer_Admin_Columns {
 		$new_columns = array();
 		foreach ( $columns as $key => $value ) {
 			if ( $key === 'date' ) {
-				$new_columns['wp_aw_cost'] = '💰 AI Cost';
+				$new_columns['wp_aw_cost'] = '💰 OpenRouter Cost';
 			}
 			$new_columns[ $key ] = $value;
 		}