fix(imgproxy): URL-encode plain source URLs

- Use encodeURIComponent for source URLs in plain/ format
- Prevents 308 redirect loops caused by double-slash normalization
- Prevents invalid URL structures for imgproxy

lib/imgproxy.ts

@@ -60,5 +60,5 @@ export function getImgproxyUrl(src: string, options: ImgproxyOptions = {}): stri
   // Format: <base_url>/unsafe/<options>/plain/<source_url>[@<extension>]
   const suffix = extension ? `@${extension}` : '';
 
-  return `${baseUrl}/unsafe/${processingOptions}/plain/${absoluteSrc}${suffix}`;
+  return `${baseUrl}/unsafe/${processingOptions}/plain/${encodeURIComponent(absoluteSrc)}${suffix}`;
 }