Vladimir Zagainov c58fbb50b1 feat: implement observability and metrics (Task 22) ...

- Add metrics package tracking cache hit-rate, API quota, circuit breaker trips, search time
- Integrate metrics with cache layer, yandex client, and API handlers
- Add /metrics HTTP endpoint for Prometheus-compatible metrics exposure
- Write tests for metrics functionality across cache, yandex, and API handlers
- Update test files to support new metrics infrastructure

2026-08-17 15:27:44 +03:00

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