sepehr 26dfa08730 feat: add Prometheus metrics + fix CI/CD health check port ...

- Add prometheus-client dependency
- Create middleware/metrics.py with PrometheusMiddleware
- Expose /metrics endpoint in Prometheus text format
- Track http_requests_total, translation_total, translation_duration_seconds,
  file_size_bytes
- Instrument translate routes with record_translation() and record_file_size()
- Fix deploy.yml health check: localhost:8000 -> localhost:8001 (Portainer conflict)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-15 14:33:10 +02:00

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