fix: add proper ImageMagick WASM initialization with CDN URL

The initializeImageMagick() function requires a URL argument pointing
to the WASM file. Without it, the library won't properly load and
conversions may fail.

Changes:
- Add initializeImageMagick() call with CDN URL
- Use jsDelivr CDN for magick.wasm file
- Matches the installed package version (0.0.30)

This ensures ImageMagick WASM is properly initialized before performing
image conversions, preventing potential runtime errors.

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

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

lib/converters/imagemagickService.ts

@@ -26,7 +26,11 @@ export async function convertWithImageMagick(
     if (onProgress) onProgress(30);
 
     // Import ImageMagick functions
-    const { ImageMagick } = await import('@imagemagick/magick-wasm');
+    const { ImageMagick, initializeImageMagick } = await import('@imagemagick/magick-wasm');
+
+    // Initialize ImageMagick with WASM URL from CDN
+    const wasmUrl = 'https://cdn.jsdelivr.net/npm/@imagemagick/magick-wasm@0.0.30/dist/magick.wasm';
+    await initializeImageMagick(wasmUrl);
 
     if (onProgress) onProgress(40);