docs: update nightly remote WAL logical pruning docs

[Copilot]

What's Changed in this PR

This updates the nightly Remote WAL documentation for the new auto_prune_logical_delete metasrv option introduced by the upstream feature. The English and Chinese nightly docs now show how to enable logical pruning for Kafka deployments that do not support DeleteRecords.

• Nightly Remote WAL config

  • Added auto_prune_logical_delete = false with an inline comment to the metasrv configuration example in the EN and ZH nightly docs, clarifying when to set it to true.

• Option reference

  • Documented that the option advances GreptimeDB's metadata prune marker without issuing Kafka DeleteRecords.
  • Clarified that it is intended for Kafka environments where DeleteRecords is unavailable.
  • Added note that when enabled, actual data removal from Kafka topics relies on Kafka's own retention and cleanup policies.

• Kafka permissions section

  • Updated the Delete records permission entry to indicate it is not required when auto_prune_logical_delete = true, resolving the contradiction for deployments that enable logical pruning.

[wal]
auto_prune_interval = "30m"
auto_prune_logical_delete = false  # set to true if your Kafka deployment does not support DeleteRecords

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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[Copilot]

Pull request overview

Updates the nightly Remote WAL documentation (EN + ZH) to include and describe the new auto_prune_logical_delete Metasrv option for Kafka environments where DeleteRecords is unavailable.

Changes:

• Added auto_prune_logical_delete to the Metasrv configuration example in the nightly Remote WAL docs (EN/ZH).
• Added an option reference entry explaining that logical pruning advances GreptimeDB’s metadata marker while skipping Kafka DeleteRecords.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
docs/user-guide/deployments-administration/wal/remote-wal/configuration.md	Adds the new Metasrv Remote WAL pruning option to the example config and options table.
i18n/zh/docusaurus-plugin-content-docs/current/user-guide/deployments-administration/wal/remote-wal/configuration.md	Mirrors the same option addition and explanation for the Chinese nightly docs.

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[WenyXu]

@copilot apply suggestions

[Copilot]

@copilot apply suggestions

Applied all four suggestions in commit docs: apply reviewer suggestions for auto_prune_logical_delete:

• Added inline comments in both EN and ZH config examples clarifying when to set auto_prune_logical_delete = true
• Updated the option description in both files to note that when enabled, actual data removal from Kafka topics relies on Kafka's own retention and cleanup policies
• Updated the permissions sections in both files to indicate that the Delete permission is not required when auto_prune_logical_delete = true