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>

package.json

@@ -41,7 +41,8 @@
     "tailwindcss": "^3.4.0",
     "typescript": "5.2.2",
     "use-debounce": "^10.0.0",
-    "zod": "^3.22.2"
+    "zod": "^3.22.2",
+    "zxing-wasm": "^2.2.4"
   },
   "devDependencies": {
     "@types/bcrypt": "^5.0.1",