[ENHANCEMENT] Add performance monitoring dashboard

[RakshakIT]

Description

Add real-time performance monitoring to track API response times, database query performance, and system health.

Proposed Solution

• Create admin dashboard tab showing:
  • Average API response times
  • Slowest endpoints
  • Database query performance
  • Memory and CPU usage
  • Error rate tracking

Technical Approach

• Use existing analytics infrastructure
• Add server-side performance tracking
• Create new admin panel tab
• Display metrics using Recharts

Benefits

• Identify performance bottlenecks
• Proactive issue detection
• Better platform optimization