Jan-Marlon Leibl b935209142 fix(claude-code): add oauthToken config for subscription SDK auth ...

`claude login` alone does not authorize SDK / non-interactive
(`claude -p`) usage. Anthropic gates that behind a separate long-lived
token minted by `claude setup-token`. Without it, subscription users
hit `billing_error` from the SDK even though interactive Claude Code
works fine.

Changes:

- ClaudeCodeConfig.oauthToken: new optional field. When set, the
  provider exports it as CLAUDE_CODE_OAUTH_TOKEN before invoking the
  SDK, which makes the SDK bill against the user's Pro/Max
  subscription instead of API credits.
- apiKey continues to work for users with a console API key. If both
  are present, oauthToken takes precedence.
- billing_error / authentication_failed messages now point users at
  `claude setup-token` so the fix is obvious from the error alone.
- README: rewrite the Claude Code section to document both modes and
  the `claude setup-token` step explicitly.
- examples/claude-code.ts: read CLAUDE_CODE_OAUTH_TOKEN from env so
  the smoke test actually works for subscribers.

2026-05-21 14:56:14 +02:00

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