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* mq/kafka: wait for a filer to register instead of panicking on an empty list NewSeaweedMQBrokerHandler queried the masters for filers once, ~2 s after start, and handed an empty list to NewFilerClientAccessor, which panics. A fresh filer registers only after its empty-membership confirm window (10 s), so a gateway started with a fresh cluster crashed (Kafka Quick Test, kafka-gateway exit 2). Retry while the list is empty for up to 60 s, then return an error. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> * mq/kafka: wait out a transient-empty broker listing too A fresh SMQ broker registers with the masters on the same announce delay as a filer, so the one-shot broker lookup could fail startup the same way. Generalize waitForFilers into waitForClusterNodes and bound both discoveries by the same window; the empty-broker check becomes unreachable and drops away. * mq/kafka: wait out the broker health check like node discovery A broker announces to the masters before it has acquired its balancer lock, so the gateway's three-attempt probe could still fail fast on a fresh cluster. Retry FindBrokerLeader for the same window the caller waits out empty listings. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com> Co-authored-by: user.email <chrislusf@users.noreply.github.com> Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>