feat: add gpt-4.5

[mislavjc]

This pull request includes several changes to enhance the handling of API keys and model selection in the settings and chat pages. The most important changes include adding support for the new model "gpt-4.5-preview", modifying the AuthModal component to handle closing events, and updating the settings logic to prompt for an API key when selecting certain models.

Enhancements to model support and settings logic:

• api/plugins/__init__.py: Added support for the "gpt-4.5-preview" model in the SettingConfig class.
• components/ui/SettingsDrawer.tsx: Updated the SettingsContent function to handle the selection of the "gpt-4.5-preview" model and prompt for an API key if necessary. This includes changes to reset the model if the current provider doesn't support it and handle pending model changes. [1] [2] [3] [4] [5] [6]

Modifications to AuthModal component:

• components/ui/AuthModal.tsx: Added an optional onClose prop to the AuthModal component and updated the Dialog component to call onClose when the modal is closed. [1] [2]
• components/ui/SettingsDrawer.tsx: Imported the AuthModal component and utilized it to handle API key submissions and modal closing events. [1] [2]

Updates to chat and home pages:

• app/chat/page.tsx and app/page.tsx: Added the onClose prop to the AuthModal component to ensure the modal can be closed properly. [1] [2]