Archive and Restore for Proposal Templates

Description:
Currently, we only support copying proposal templates. Introducing the ability to archive and restore templates would be a valuable enhancement—especially in scenarios where the "Update from Template" feature is used with imported proposals. This would provide more flexibility in managing and reusing templates across different environments or over time.

Use Case / Example:
A customer with multiple instances of BOE Pro would be able to move proposal templates from one instance to another, archive them when not in use, and restore them later as needed.