Add disabled-by-organization section in model picker for enterprise plans

[Copilot]

Description

Business/Enterprise users should see unavailable known model IDs in the picker as a disabled, greyed-out section labeled “Disabled by your organization,” based on access returned from /models.

• Model picker segregation
  • Adds a dedicated disabled section for predefined model IDs absent from the accessible model list.
• Model availability detection
  • Uses the full model list to decide which IDs are missing and should be shown disabled.

const disabledModels = organizationDisabledModels.filter(model => !availableModelIds.has(model.id));
return disabledModels.map(model => ({
	id: `disabled.${model.id}`,
	enabled: false,
	category: organizationDisabledCategory,
	label: model.label
}));

• Screenshot
  • https://github.com/user-attachments/assets/436d3ff6-db7b-4609-b255-9abec0805d94

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