docs: private-beta 403 message points at the web application form

[Him188]

Summary

Sync the 403 table with platform-api (fishaudio/platform-api#1267): the rollout refusal message is now Agent platform is in private beta. Apply for access at https://fish.audio/app/agents, and the cause cell tells readers to sign in and submit the application form there.

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Summary by CodeRabbit

• Documentation
  • Updated the 403 error guidance to explain that agent platform access is currently limited to a private beta.
  • Added instructions for applying for access.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: da32dfcb-4f5a-46e8-9f5b-e523e4d28b46

📥 Commits

Reviewing files that changed from the base of the PR and between f8d1ed4 and b3a7b04.

📒 Files selected for processing (1)

• api-reference/agent-errors.mdx

📝 Walkthrough

Walkthrough

The 403 error table now states that the agent platform is in private beta and links to the access application.

Changes

Agent error documentation

Layer / File(s)	Summary
Update 403 access guidance api-reference/agent-errors.mdx	The 403 error table replaces the account-access message and support guidance with a private-beta message and an application URL.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the documentation change that updates the private-beta 403 message to point users to the application form.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent-beta-application

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