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issue: https://github.com/milvus-io/milvus/issues/41690 - Merge leader view and channel management into ChannelDistManager, allowing a channel to have multiple delegators. - Improve shard leader switching to ensure a single replica only has one shard leader per channel. The shard leader handles all resource loading and query requests. - Refine the serviceable mechanism: after QC completes loading, sync the query view to the delegator. The delegator then determines its serviceable status based on the query view. - When a delegator encounters forwarding query or deletion failures, mark the corresponding segment as offline and transition it to an unserviceable state. Signed-off-by: Wei Liu <wei.liu@zilliz.com>