24b70f56515dd58c323b9c2f8196dca95c1f2c5d
Add ConnectionRateLimiter (HashMap<IpAddr, usize>) and AuthAttemptLimiter with check/on_connect/on_disconnect and check/on_failure methods. Integrate into ServerHandler with structured tracing::info! logging for auth attempts, connection opened/closed events. No logging of tunnel destinations per ADR-006. Also add ForwardError type and fix type annotation in forward.rs to unblock compilation.
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