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Replace the leaky *redis.Client field on Server with a PresenceTracker
interface that receives connect/rename/disconnect lifecycle events. This
removes Redis-specific set encoding from hotline/server.go and the session
handlers, and drops the redis dependency from the hotline package.
The Redis implementation moves to mobius.RedisPresenceTracker, which owns
the legacy "login::ip"/"login:nickname:ip" set encoding so existing
deployments keep working. The API server reads online users through a new
OnlineLister interface and falls back to the in-memory ClientMgr when no
presence tracker is configured. Startup clearing of stale online state now
happens unconditionally when Redis is configured, not only when the API
server is enabled.
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