WebP Express CloudHost.es Fix v0.25.9-cloudhost

✅ Fixed bulk conversion getting stuck on missing files
✅ Added robust error handling and timeout protection
✅ Improved JavaScript response parsing
✅ Added file existence validation
✅ Fixed missing PHP class imports
✅ Added comprehensive try-catch error recovery

🔧 Key fixes:
- File existence checks before conversion attempts
- 30-second timeout protection per file
- Graceful handling of 500 errors and JSON parsing issues
- Automatic continuation to next file on failures
- Cache busting for JavaScript updates

🎯 Result: Bulk conversion now completes successfully even with missing files

🚀 Generated with Claude Code (https://claude.ai/code)

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

lib/classes/Validate.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace WebPExpress;
+
+use \WebPExpress\ConvertersHelper;
+use \WebPExpress\ValidateException;
+use \WebPExpress\SanityCheck;
+
+class Validate
+{
+
+    public static function postHasKey($key)
+    {
+        if (!isset($_POST[$key])) {
+            throw new ValidateException('Expected parameter in POST missing: ' . $key);
+        }
+    }
+
+    public static function isConverterId($converterId, $errorMsg = 'Not a valid converter id')
+    {
+        SanityCheck::pregMatch('#^[a-z]+$#', $converterId, $errorMsg);
+        if (!in_array($converterId, ConvertersHelper::getDefaultConverterNames())) {
+            throw new ValidateException($errorMsg);
+        }
+    }
+
+}