Mark todo as complete or incomplete

Marks a todo as complete or incomplete by setting or clearing the completion status.

Permission Requirements:

• The authenticated user must be an employee or crew member.
• Crew users can only complete/uncomplete incomplete todos where they are the assigned user or creator.

Completion Behavior:

• When completed is set to true:
  • date_completed is set to the current timestamp
  • completed_by is set to the authenticated user
• When completed is set to false or omitted:
  • date_completed is cleared (set to null)
  • completed_by is cleared (set to null)

Response Format:

The response includes full detail information with created_by and completed_by user objects.