fix: barcode scanner WASM loading and Android camera permission

- Exclude barcode-detector from Vite optimizeDeps to prevent WASM mangling
- Self-host ZXing WASM via Vite ?url import with prepareZXingModule
- Use barcode-detector/ponyfill instead of deprecated /pure export
- Separate barcode-detector/zxing-wasm into own chunk
- Add CAMERA permission to Android manifest for Tauri app

src-tauri/gen/android/app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_LOCATION" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+    <uses-permission android:name="android.permission.CAMERA" />
 
     <!-- AndroidTV support -->
     <uses-feature android:name="android.software.leanback" android:required="false" />