Translate v2 API endpoints and groups field to es, fr, zh

[mintlify]

Summary

• Updated api/introduction.mdx translations (es, fr, zh) to reflect v2 API endpoint paths and renamed endpoints (Create agent job, Get agent job, Send follow-up message, Create assistant message)
• Added groups frontmatter field translation to organize/pages.mdx in all three languages

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Note

Low Risk
Documentation-only updates to localized MDX content; main risk is broken/incorrect links or inconsistent naming for the new v2 endpoints.

Overview
Updates the Spanish, French, and Chinese api/introduction.mdx docs to point to the v2 agent endpoints (adds send-message, switches paths to /agent/v2/...) and to rename/retarget the assistant endpoint to create-assistant-message-v2, including the related authentication and common-use-case references.

Tweaks localized organize/pages.mdx wording for the groups frontmatter field description (plus minor punctuation/typography fixes such as apostrophes/newline at EOF).

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