Add performance profiling with react-native-performance

[Smartdevs17]

Description

No performance profiling exists, making optimization guesswork. Integrate performance monitoring and profiling.

Acceptance Criteria

• react-native-performance integration
• Screen render time tracking
• API call latency monitoring
• Memory usage tracking
• Performance regression CI gate
• Performance dashboard in development

Technical Scope

• src/hooks/usePerformanceProfiler.ts
• src/services/performanceMonitor.ts
• package.json
• Edge: profiling overhead in production, metric aggregation, alert fatigue