feat: implement metrics collection system for performance, errors, an…

[fridaypetra55-afk]

…d business metrics

• Add MetricsCollector singleton (src/metrics/MetricsCollector.ts)
  • recordRequest: HTTP performance metrics with slow-request warnings
  • recordError: error tracking by type and status code
  • recordEvent: business event tracking (registrations, enrollments, certificates)
  • getSummary: aggregated snapshot with system metrics (uptime, memory, CPU)
  • Ring-buffer trimming to bound memory usage (default 10k entries/category)
• Add metrics routes (src/routes/metrics.routes.ts)
  • GET /api/v1/metrics - aggregated summary
  • GET /api/v1/metrics/performance - raw performance entries
  • GET /api/v1/metrics/errors - raw error entries
  • GET /api/v1/metrics/business - raw business event entries
  • POST /api/v1/metrics/reset - clear all metrics
• Register /metrics route in src/routes/index.ts
• Add 36 unit tests with 100%% coverage (tests/metrics.test.ts)
• Fix malformed package.json (duplicate keys, missing commas)
• Add jest.setup.js for test environment setup

Closes #619
Closes #617
Closes #616
Closes #618

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