feat: WordPress plugin versioning + heatmap fix + dynamic latest download

- Add VERSION file (1.5.4) for tracking WP plugin version
- Update plugin headers to 1.5.4 (cannaiq-menus.php, crawlsy-menus.php)
- Add dynamic /downloads/cannaiq-menus-latest.zip route that auto-redirects
  to highest version (no manual symlinks needed)
- Update frontend download links to use -latest.zip
- Fix StateHeatmap.tsx to parse API values as numbers (fixes string concat bug)
- Document versioning rules in CLAUDE.md

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

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

wordpress-plugin/cannaiq-menus.php

@@ -3,7 +3,7 @@
  * Plugin Name: CannaIQ Menus
  * Plugin URI: https://cannaiq.co
  * Description: Display cannabis product menus from CannaIQ with Elementor integration. Real-time menu data updated daily.
- * Version: 1.5.3
+ * Version: 1.5.4
  * Author: CannaIQ
  * Author URI: https://cannaiq.co
  * License: GPL v2 or later
@@ -15,7 +15,7 @@ if (!defined('ABSPATH')) {
     exit; // Exit if accessed directly
 }
 
-define('CANNAIQ_MENUS_VERSION', '1.5.3');
+define('CANNAIQ_MENUS_VERSION', '1.5.4');
 define('CANNAIQ_MENUS_API_URL', 'https://cannaiq.co/api/v1');
 define('CANNAIQ_MENUS_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('CANNAIQ_MENUS_PLUGIN_URL', plugin_dir_url(__FILE__));