feat: migrate label rendering from sharp to resvg for improved SVG support

paperless-backend/src/label-print-agent/label-renderer.service.ts

@@ -1,6 +1,6 @@
 import { Injectable, Logger } from '@nestjs/common';
 import * as QRCode from 'qrcode';
-import sharp from 'sharp';
+import { Resvg } from '@resvg/resvg-js';
 import type { LabelElement } from '../database/entities/barcode-template.entity';
 
 const MM_TO_PX = 300 / 25.4; // 300 DPI
@@ -89,6 +89,7 @@ export class LabelRendererService {
   ${parts.join('\n  ')}
 </svg>`;
 
-    return sharp(Buffer.from(svg)).png().toBuffer();
+    const resvg = new Resvg(svg, { font: { loadSystemFonts: true } });
+    return Buffer.from(resvg.render().asPng());
   }
 }