docs: add SSTS_MANIFEST and SSTS_STORAGE system tables

[Copilot]

What's Changed in this PR

Added documentation for two new INFORMATION_SCHEMA tables introduced in GreptimeDB PR #6924:

SSTS_MANIFEST - SST file metadata from manifest

• 20 fields including file paths, sizes, levels, time ranges, row counts, visibility status
• Query SST files by table, level, time range, or visibility
• Calculate storage metrics per table

SSTS_STORAGE - SST files from storage layer

• 4 fields: file path, size, last modified timestamp, node ID
• Detect orphaned files by comparing against manifest
• Audit storage layer for inconsistencies

Both tables documented in English and Chinese with schema descriptions, field explanations, and SQL examples.

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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Original prompt

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This section details on the original issue you should resolve

<issue_title>Update docs for feat: add ssts releated system table</issue_title>
<issue_description>A document change request is generated from GreptimeTeam/greptimedb#6924</issue_description>

<agent_instructions>Only update nightly document</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Update docs for feat: add ssts releated system table #2108

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