Luis Pater f2e2d713b2 fix(auth): propagate upstream error causes in auth selection failures ...

- Attach candidate upstream errors as causes to scheduler availability and cooldown errors.
- Introduce `errorWithCause` wrapper to extract and display upstream error summaries.
- Enrich auth selection error messages with upstream details and preserve model cooldown errors.
- Forward `Retry-After` response headers for model cooldown errors in Claude Code handler.

Closes: #5365

2026-09-01 08:15:51 +08:00

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handlers

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management.go

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options.go

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