Added MAC Core media policy controls

Property	Value
description	Added the shared media settings and policy services used across Circea WordPress builds.
version	1.0.0
type	Create
related	Settings

• Added media policy controls for custom image sizes and removed image sizes.
• Added shared upload-policy controls for font uploads, blocked video uploads, and image-compression behavior.
• Kept media behavior configurable from the plugin instead of re-implementing those defaults in each project theme.
• Shipped the media controls as part of the repository-backed mac_core_settings surface.