Add API V3 keyspace identity support#2017

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Commits on Jul 8, 2026

Merge remote-tracking branch 'origin/master' into task22.3/client-go-apiv3-keyspace
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Update APIV3 PD and kvproto dependencies
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Encode API V3 RPC keys with physical prefix
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apicodec: avoid double encoding API V3 physical keys
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apicodec: keep API V3 RPC keys logical
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apicodec: keep API V3 region keys logical
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apicodec: bound API V3 region scans to keyspace
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apicodec: fix API V3 physical keyspace prefix
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apicodec: clamp API V3 bucket keys to keyspace
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Commits on Jul 15, 2026

Commits on Jul 20, 2026

*: update kvproto oneof dependencies
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Commits on Jul 22, 2026

*: update kvproto to latest apiv3
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