fix(line): classify SDK errors with HTTP status and add client timeout

Address review feedback:
- Use *WithHttpInfo SDK variants to get HTTP response status codes
- Map status codes via ClassifySendError (429→ErrRateLimit, 5xx→ErrTemporary, 4xx→ErrSendFailed)
- Fall back to ClassifyNetError for network-level failures
- Configure SDK with 30s timeout HTTP client

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

go.sum

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