Prepare for production build

- Downgrade react-native to 0.81.5 (matches Expo SDK 54)
- Downgrade react to 19.1.0 and related @react-native packages
- Disable New Architecture (react-native-nfc-manager untested)
- Add expo install/doctor exclusions for version-locked deps
- Configure babel to strip console.log/warn in production
- Add logger utility for development-only logging
- Add component and data module exports

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

src/utils/logger.ts

@@ -3,8 +3,6 @@
  * All console.log statements in the app should use this logger
  */
 
-/* eslint-disable no-console */
-
 const isDev = __DEV__;
 
 export const logger = {