Add API response time monitoring

[meshackyaro]

Description

Endpoint response times not tracked. Performance regressions undetectable.

Component

Backend

Difficulty

🟡 Medium

Tasks

• Add response time middleware
• Log response times
• Track percentiles (p50, p95, p99)
• Add slow request warnings
• Expose metrics for monitoring

Acceptance Criteria

• Response times tracked per endpoint
• Slow requests identified
• Metrics available for alerting

Estimated Time

2 days