Translate JWT host field changes

[mintlify]

Summary

• Added host field documentation to JWT authentication code examples in all three languages
• Added host parameter description to user data format section
• Updated code examples to use DOCS_HOST constant for better clarity

---

Note

Low Risk
Documentation-only changes; no runtime code paths are modified, with risk limited to potential confusion if examples are incorrect.

Overview
Adds the host field to the documented User payload for JWT auth (type + JSON example) and introduces a new parameter description explaining that Mintlify validates the JWT host against the request host.

Updates the JWT code samples (TypeScript + Python) in es, fr, and zh to set host via a DOCS_HOST constant and to build the /login/jwt-callback redirect URL from that constant (plus minor French copy edits).

^{Written by Cursor Bugbot for commit 790762a. This will update automatically on new commits. Configure here.}