docs: add ALTER DATABASE compaction options

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Documents new ALTER DATABASE support for compaction options added in GreptimeTeam/greptimedb#7251.

Changes

• ALTER DATABASE syntax: Added compaction.twcs.time_window, compaction.twcs.max_output_file_size, and compaction.twcs.trigger_file_num options
• Examples: Added SQL examples for setting and unsetting compaction options at database level
• Localization: Updated both English and Chinese documentation

Usage

Database-level compaction options can now be modified after creation:

ALTER DATABASE db SET 'compaction.twcs.time_window'='2h';
ALTER DATABASE db SET 'compaction.twcs.max_output_file_size'='500MB';
ALTER DATABASE db SET 'compaction.twcs.trigger_file_num'='8';
ALTER DATABASE db UNSET 'compaction.twcs.time_window';

These options mirror the existing ALTER TABLE compaction support and the CREATE DATABASE options already documented.

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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: support alter database compaction options</issue_title>
<issue_description>A document change request is generated from GreptimeTeam/greptimedb#7251</issue_description>

<agent_instructions>不要修改最新稳定版的文档</agent_instructions>

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

• Fixes Update docs for feat: support alter database compaction options #2226

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