Story: Add a Recipe to a Menu

As a Host, I want to add recipes from my collection to an event's menu, so that I can finalize the drink offerings for my party.

Acceptance Criteria

I can select an existing event.
I can view the menu(s) associated with that event.
I can browse or search my list of saved recipes.
I can add one or more recipes to the selected menu.
The menu should update to show the list of added drinks.
The system should begin to aggregate the ingredient requirements for the event based on the menu.