bark: deprecate access_token surfaces (no longer enforced server-side)

Kobe Nysrequested to merge
access-token-dep into master

Summary by CodeRabbit

  • Chores
    • Deprecated access-token surfaces across CLI, client libraries, server, and telemetry; CLI --access-token is hidden from help and deprecation warnings added. Tokens are still accepted but not enforced; removal planned in a future release.
  • Documentation
    • Updated changelogs, API docs, and OpenAPI schema to mark server access token fields/headers as deprecated and note migration guidance.
Edited by coderabbit

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