Allow disabling individual built-in models

Feature request

I'd like to be able to disable individual built-in Command Code models from the /model menu.

Right now, ~/.commandcode/providers.json supports disabling an entire BYOK provider with "disabled": true, but there doesn't seem to be a supported way to hide or disable one specific built-in model.

I'd like a configuration option at user scope that lets me disable specific models without removing access to the rest of the catalog. This would make the model picker less cluttered and make it easier to prevent accidental selection of models I don't want to use.

Suggested behavior

• Support an allowlist or denylist for built-in model IDs.
• Apply it to the /model menu and model selection shortcuts.
• Keep the setting at user scope so it applies across projects.
• Keep the current BYOK provider-level disabled behavior unchanged.

Example

{
  "disabledModels": ["some/model-id"]
}

Inizia dalla configurazione a livello utente rappresentata da ~/.commandcode/providers.json, quindi segui il menu /model e le scorciatoie per la selezione del modello. Verifica come vengono caricati e filtrati gli ID dei modelli integrati e le impostazioni disabilitate a livello di provider. Il lavoro è completato quando un utente può disabilitare modelli integrati selezionati tra più progetti, mentre il comportamento esistente del provider BYOK rimane invariato.