Add an observable NativePHP scanner benchmark

[prateekbhujel]

What this adds

• Adds a native scanner benchmark screen to the Super Stack starter.
• Measures the coarse scan-to-PHP path separately from PHP-side deduplication.
• Includes a deterministic QR fixture, feature coverage, and reproduction notes.
• Registers the open-source CameraX/ML Kit scanner implementation explicitly in the NativePHP plugin provider.

Verification

• php artisan test --no-ansi — 5 tests, 19 assertions
• vendor/bin/pint ... --test — clean
• git diff --check — clean
• Android debug APK builds and installs on a Xiaomi Android 15 device.

The physical QR scan is the final device-side validation step; the benchmark does not claim React Native parity without a same-device comparison.

[coderabbitai]

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[prateekbhujel]

Closing this because it is not aligned with the intended task.