docs: enhance trigger

[fengys1996]

What's Changed in this PR

This pr mainly add a description of the trigger status to enhance the trigger doc.

TODO:

• sync change to version 1

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.

[killme2008]

Is it ready for review? @fengys1996

[fengys1996]

Is it ready for review? @fengys1996

It's still a draft, and there are still some things to do.

[Copilot]

Pull request overview

This PR enhances the trigger documentation by adding comprehensive coverage of trigger status and state management. The update transforms the documentation from a Vector-based monitoring example to a clearer, self-contained tutorial focused on alert state transitions.

Key Changes:

• Added a "Key Features" section highlighting SQL-native design, multi-stage state management, rich context, and ecosystem compatibility
• Restructured the quick start example to use a simpler load1 table with a bash script for data simulation instead of Vector
• Added detailed coverage of trigger status queries and alert state transitions (pending → firing → inactive) with example outputs
• Expanded the reference section to include links to INFORMATION_SCHEMA.TRIGGERS and INFORMATION_SCHEMA.ALERTS

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
docs/enterprise/trigger.md	English version enhanced with state management details, simplified examples, and new status query sections
i18n/zh/docusaurus-plugin-content-docs/current/enterprise/trigger.md	Chinese translation with equivalent content updates

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