feat: Add Hermes engine optimizations for Android performance

[Codex723]

Closes #419

Summary

Implement comprehensive Hermes engine optimizations to improve Android performance, targeting:

• Startup time reduction (<2s target)
• Frame rate improvement (60fps on mid-range devices)
• Memory usage optimization

Changes

Configuration Updates

• metro.config.js: Enabled Hermes transformer, production minification with console removal, and @shopify/metro-serializer-hermes for bytecode serialization
• babel.config.js: Added babel-plugin-module-resolver and babel-plugin-transform-remove-console for optimized builds
• app.json: Added jsEngine: hermes and optimization flags (--inline-store-on-put, --allocation-profile)
• app.config.js: Extended with runtime Hermes configuration and added hermesOptimizations to extra config
• package.json: Added @shopify/metro-serializer-hermes dependency for bytecode serialization
• performance-budget.json: Extended with Android-specific startup time (2000ms) and FPS (60fps) targets

New Utility Modules

• src/utils/hermesOptimizer.ts: Identifies critical modules (store, i18n, navigation, session) for pre-compilation
• src/utils/startupTimeOptimizer.ts: Measures Android startup time with AppState tracking

Tests

• src/utils/tests/hermesOptimizer.test.ts: Unit tests for Hermes optimizer
• src/utils/tests/startupTimeOptimizer.test.ts: Unit tests for startup measurement

Acceptance Criteria

• Hermes engine configuration tuning
• Pre-compiled bytecode for critical modules
• Android startup time reduction (target: <2s)
• Frame rate improvement (60fps on mid-range devices)
• Memory usage optimization

Testing

Run npm run performance:ci to validate performance budget.

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