Meetings to allow unauthenticated participants option

add "Allow guests to join meetings" eg. unauthenticated users option to meeting options
 

edit meeting button:
<img width="436" height="172" alt="image" src="https://github.com/user-attachments/assets/17c280c1-7b81-457f-99ba-d32b58164a50" />


meeting options screen:
<img width="656" height="294" alt="image" src="https://github.com/user-attachments/assets/416fcbe0-7066-4301-9d94-2c7c735ef0c9" />
