Add project locking to prevent accidental deletion

[sakinurrahman]

Adds a lock/unlock toggle to projects. When a project is locked, it cannot be deleted until the user explicitly unlocks it first.
Changes:

Added is_locked column to projects table
Added lock/unlock toggle in project settings
Delete action is blocked with an error message when project is locked

[ShadowArcanist]

What is the use of this?

Coolify doesn't allow user to delete project if it has resource and we already have two step confirmation for project deletion