holynn c857592558 fix(cli): allow custom:* provider slugs in model validation ...

Two related fixes for custom_providers model switching:

1. validate_requested_model() now recognizes custom:<name> slugs
   (e.g. custom:volcengine) as custom endpoints, not generic providers.
   Previously only the bare 'custom' slug matched the relaxed validation
   branch, causing model validation to fail with 'not found in provider
   listing' for all named custom providers.

2. switch_model() now consults the custom_providers list when deciding
   whether to override a validation rejection. If the requested model
   matches the entry's 'model' field or any key in its 'models' dict,
   the switch is accepted even when the remote /v1/models endpoint does
   not list it.

Both changes are covered by existing tests (86 passed).

2026-05-04 01:39:06 -07:00

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