* fix(anthropic): support ANTHROPIC_AUTH_TOKEN as alternative to ANTHROPIC_API_KEY
Anthropic SDK supports two mutually exclusive auth methods: apiKey (sent as
x-api-key header) and authToken (sent as Authorization: Bearer header). Detect
either env var during provider detection and credential validation, and pass
authToken to createAnthropic when only ANTHROPIC_AUTH_TOKEN is set.
* docs(anthropic): document ANTHROPIC_AUTH_TOKEN and refine error message
- Add ANTHROPIC_AUTH_TOKEN to env.example and the en/cn/ja provider docs
- Reword the missing-credential error to "Either ... or ..." for readability
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Co-authored-by: duyunjie <[email protected]>
Co-authored-by: dayuan.jiang <[email protected]>
