fix(cli): clarify Anthropic hint to Claude Pro/Max

[hashemirafsan]

Issue for this PR

Closes #15975

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

The Anthropic provider hint in the CLI currently says Claude Max or API key, which is incomplete and can mislead users into thinking only Max is supported.

This PR updates that hint to Claude Pro/Max or API key in both CLI entry points:

• packages/opencode/src/cli/cmd/auth.ts
• packages/opencode/src/cli/cmd/tui/component/dialog-provider.tsx

Why this works:

• The auth flow supports Pro/Max and API-key paths.
• Updating the hint makes provider selection copy accurate before method selection.
• This is a copy-only change and does not alter auth behavior.

How did you verify your code works?

• Verified both updated strings in the changed files.
• Confirmed there are no remaining Claude Max or API key matches in packages/opencode/src.
• Confirmed the change scope is copy-only (2 lines in 2 files).

Screenshots / recordings

N/A (CLI text-only copy change)

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍