Translate API introduction v2 endpoint updates to es, fr, zh

[mintlify]

Summary

Updated translated versions of api/introduction.mdx in es, fr, and zh to reflect v2 API endpoint changes:

• Agent endpoints updated from /api/agent/ to /api/agent/v2/
• "Get all agent jobs" replaced with "Send follow-up message" (/api/agent/v2/send-message)
• "Generate assistant message" renamed to "Create assistant message" with path /api/assistant/create-assistant-message-v2

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Note

Low Risk
Low risk documentation-only changes that update translated endpoint links/names; primary risk is broken links or mismatched endpoint naming in localized docs.

Overview
Updates localized api/introduction.mdx pages (es, fr, zh) to reflect v2 API endpoint changes.

Agent docs now point to /api/agent/v2/*, replace the prior “get all agent jobs” reference with send-message, and update assistant messaging from “Generate assistant message” to create-assistant-message-v2 in both the endpoint lists and authentication/use-case sections.

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