feat: integrate rozenite devtools into example app

[adamTrz]

Summary

• integrate Rozenite into the Expo example app by wiring the Rozenite Metro plugin into Metro and mounting useAiSdkDevTools at the app root
• emit AI SDK telemetry for example-app chat requests through a shared getAiSdkTelemetry helper and experimental_telemetry on streamText
• document how to verify the AI SDK Profiler panel in the example app, including the stale DevTools window gotcha we hit during validation

Why

The example app already demonstrates the local model providers, but it did not expose the AI SDK Profiler workflow end-to-end. This change makes the demo app usable as the reference integration for Rozenite plus @react-native-ai/dev-tools in this monorepo.

Impact

Developers can now run apps/expo-example, open React Native DevTools, switch to Rozenite, and inspect spans for chat requests from the example app.

Validation

• run example app on simulator
• open Chrome DevTools and verify if the AI SDK Profiler panel opens and record spans like on image below

[vercel]

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[artus9033]

Great work, just one comment and LGTM!