feat: migrate PDF417 barcode decoder from @zxing/browser to zxing-wasm

Replace @zxing/browser with zxing-wasm for better performance and smaller WebAssembly bundle size (919KB). Added middleware exclusion for .wasm files to prevent i18n routing interference.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

middleware.ts

@@ -44,7 +44,8 @@ export default async function middleware(req: NextRequest) {
 export const config = {
   // for these paths middleware will not be called
   // `pdf.worker.min.mjs` is a web worker code used by pdf.js
+  // `*.wasm` files are WebAssembly modules used by zxing-wasm
   matcher: [
-    '/((?!api|_next/static|_next/image|.*\\.png$|pdf.worker.min.mjs$|.*\\.webm$).*)',
+    '/((?!api|_next/static|_next/image|.*\\.png$|pdf.worker.min.mjs$|.*\\.wasm$|.*\\.webm$).*)',
   ],
 };