docs: add repartition section

[WenyXu]

What's Changed in this PR

as title

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.

[Copilot]

Pull request overview

Adds a new “Repartition” documentation page and wires it into the docs navigation, with corresponding updates in the Chinese localized docs and glossary to reflect the new concept.

Changes:

• Add new Repartition docs pages (EN + ZH) describing purpose, workflow, prerequisites, and examples.
• Add Repartition to the docs sidebar and ZH “Manage Data” overview; update ZH table-sharding page to link out to the dedicated Repartition page.
• Update Helm chart configuration docs with a GC enablement example; extend EN/ZH glossaries with “Repartition” and “Table Sharding”.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
sidebars.ts	Adds Repartition doc entry under Deployments & Administration → Manage Data.
i18n/zh/.../manage-data/table-sharding.md	Replaces in-page repartition section with a link to the dedicated Repartition page.
i18n/zh/.../manage-data/repartition.md	New ZH Repartition page (concept, prerequisites, hot partition checks, example).
i18n/zh/.../manage-data/overview.md	Adds Repartition to the ZH Manage Data overview list.
i18n/zh/.../deploy-on-kubernetes/common-helm-chart-configurations.md	Adds a “Enable GC” section with example config relevant to repartition prerequisites.
i18n/zh/.../reference/glossary.md	Adds glossary entries for Repartition and Table Sharding (ZH).
i18n/zh/.../current.json	Adds sidebar label translation for “Repartition”.
docs/user-guide/.../manage-data/repartition.md	New EN Repartition page (concept, prerequisites, hot partition checks, example).
docs/reference/glossary.md	Adds glossary entries for Repartition and Table Sharding (EN).

Comments suppressed due to low confidence (2)

docs/reference/glossary.md:207

• The glossary now contains two separate ## T sections (one for Tag/Time* and another for Trigger). With the new “Table Sharding” entry added here, it’s easy for the glossary to drift and readers may miss entries. Please consolidate to a single ## T section (move Trigger under the same heading) and keep all T entries together under it.

### Table Sharding
The technique of splitting a large table into multiple smaller partitions. In GreptimeDB, table sharding helps distribute load across regions and improve throughput for hot or large tables.

---

## T

i18n/zh/docusaurus-plugin-content-docs/current/reference/glossary.md:206

• 这里出现了两个 ## T 小节（一个包含 Tag/Time*，另一个只包含 Trigger）。新增的 “Table Sharding（表分片）” 放在第一个 ## T 下会让术语表结构更混乱、读者也更难检索。建议合并为一个 ## T 小节（将 Trigger 移到同一个 T 小节中），并把所有 T 开头术语集中在一起。

### Table Sharding (表分片)
将一张大表拆分为多个更小分区的技术。在 GreptimeDB 中，表分片有助于将负载分散到多个 region 上，并提升热点表或大表的吞吐能力。

---

## T

### Trigger (触发器)

---

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[fengjiachun]

LGTM, please sync to the v1.0 directory.

[WenyXu]

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Codex Review: Didn't find any major issues. Keep them coming!

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