Create a new user in your account.

Required Fields:

• first_name: User's first name
• email: User's email address. Must be globally unique across all accounts.
• role_id: Role ID (must match an ID from GET /roles)

Optional Fields:

• last_name: User's last name
• phone: Phone number
• user_avatar: Avatar URL

Default Values:

• active: All new users are created as active (active=1) by default. Use the deactivate endpoint to disable users after creation.

Invite Behavior:

• When a user is created with an email address, an invite is automatically created and sent.
• To re-send an invite, use the POST /users/{id}/resend endpoint.