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5a5ca2a989
This commit addresses several critical issues in the failover system: **Circuit breaker state persistence (previous fix)** - Promote ProviderRouter to ProxyState for cross-request state sharing - Remove redundant router.rs module - Fix 429 errors to be retryable (rate limiting should try other providers) **Hot-update circuit breaker config** - Add update_circuit_breaker_configs() to ProxyServer and ProxyService - Connect update_circuit_breaker_config command to running circuit breakers - Add reset_provider_circuit_breaker() for manual breaker reset **Fix HalfOpen deadlock bug** - Change half_open_requests from cumulative count to in-flight count - Release quota in record_success()/record_failure() when in HalfOpen state - Prevents permanent deadlock when success_threshold > 1 **Fix duplicate select_providers() call** - Store providers list in RequestContext, pass to forward_with_retry() - Avoid consuming HalfOpen quota twice per request - Single call to select_providers() per request lifecycle **Add per-provider retry with exponential backoff** - Implement forward_with_provider_retry() with configurable max_retries - Backoff delays: 100ms, 200ms, 400ms, etc.