Aleksey Shakhmatov 2ca930236d Add per-host circuit breaker with three-state machine ...

Implements circuit breaker as a RoundTripper middleware:
- Closed → Open after consecutive failure threshold
- Open → HalfOpen after configurable duration
- HalfOpen → Closed on success, back to Open on failure
- Per-host tracking via sync.Map for independent endpoint isolation

2026-03-20 14:22:00 +03:00

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