fix: Remove hardcoded dev mode filters from woonoow.php

🐛 CRITICAL FIX - Root Cause Found!
The plugin had hardcoded dev mode filters that forced EVERYONE into dev mode:
- add_filter('woonoow/admin_is_dev', '__return_true');
- add_filter('woonoow/admin_dev_server', fn() => 'https://woonoow.local:5173');

This caused:
- ✗ SPA trying to load from localhost:5173
- ✗ Loading @react-refresh and main.tsx (dev files)
- ✗ Not loading app.js and app.css (production files)

✅ Solution:
- Removed hardcoded filters from woonoow.php
- Commented them out with instructions
- Added debug logging to is_dev_mode()
- Updated installation checker to detect this issue

📝 For Developers:
If you need dev mode, add to wp-config.php:
define('WOONOOW_ADMIN_DEV', true);

Or use filter in your development plugin:
add_filter('woonoow/admin_is_dev', '__return_true');

🎯 Result:
- Production mode by default (no config needed)
- Dev mode only when explicitly enabled
- Better UX - plugin works out of the box

check-installation.php

@@ -125,6 +125,24 @@ header('Content-Type: text/html; charset=utf-8');
     }
     ?>
     
+    <h2>5b. Dev Mode Filter Check (woonoow.php)</h2>
+    <?php
+    $main_file = $plugin_dir . '/woonoow.php';
+    if (file_exists($main_file)) {
+        $content = file_get_contents($main_file);
+        $has_dev_filter = strpos($content, "add_filter('woonoow/admin_is_dev', '__return_true')") !== false;
+        
+        if ($has_dev_filter) {
+            echo "<div><span class='fail'>✗ FAIL</span> - Hardcoded dev mode filter found in woonoow.php!</div>";
+            echo "<pre>  This forces dev mode ON for everyone.\n";
+            echo "  Remove this line from woonoow.php:\n";
+            echo "  add_filter('woonoow/admin_is_dev', '__return_true');</pre>";
+        } else {
+            echo "<div><span class='pass'>✓ PASS</span> - No hardcoded dev mode filters</div>";
+        }
+    }
+    ?>
+    
     <h2>6. Asset URLs</h2>
     <?php
     if (function_exists('plugins_url')) {