fix: Force production mode for admin SPA assets

🐛 Problem:
- SPA not loading in wp-admin
- Trying to load from dev server (localhost:5173)
- Happening in Local by Flywheel (wp_get_environment_type() = 'development')

✅ Solution:
- Changed is_dev_mode() to ONLY enable dev mode if WOONOOW_ADMIN_DEV constant is explicitly set
- Removed wp_get_environment_type() check
- Now defaults to production mode (loads from admin-spa/dist/)

📝 To Enable Dev Mode:
Add to wp-config.php:
define('WOONOOW_ADMIN_DEV', true);

🎯 Result:
- Production mode by default
- Dev mode only when explicitly enabled
- Works correctly in Local by Flywheel and other local environments

includes/Admin/Assets.php

@@ -225,20 +225,21 @@ class Assets {
     }
 
     /** Determine dev mode:
-     *  - WP environment 'development'
-     *  - or constant WOONOOW_ADMIN_DEV=true
+     *  - ONLY enabled if constant WOONOOW_ADMIN_DEV=true is explicitly set
      *  - or filter override (woonoow/admin_is_dev)
+     *  
+     *  Note: We don't check WP_ENV to avoid accidentally enabling dev mode
+     *  in Local by Flywheel or other local dev environments.
      */
     private static function is_dev_mode(): bool {
-        $env_is_dev = function_exists('wp_get_environment_type') && wp_get_environment_type() === 'development';
+        // Only enable dev mode if explicitly set via constant
         $const_dev  = defined('WOONOOW_ADMIN_DEV') && WOONOOW_ADMIN_DEV === true;
-        $is_dev     = $env_is_dev || $const_dev;
 
         /**
          * Filter: force dev/prod mode for WooNooW admin assets.
          * Return true to use Vite dev server, false to use built assets.
          */
-        return (bool) apply_filters('woonoow/admin_is_dev', $is_dev);
+        return (bool) apply_filters('woonoow/admin_is_dev', $const_dev);
     }
 
     /** Dev server URL (filterable) */