Enatega Customer App: Don't display any restaurant on app with No products, categories etc

Is your feature request related to a problem? Please describe.
Restaurants that have no products, categories, or menu items configured are still visible to users in the app. These restaurants appear in listings and search results but contain no usable content, leading to a confusing and empty experience for the user.

Steps to Reproduce:

In the Admin panel, create or locate a restaurant with no products, categories, or menu items assigned.
Open the app and browse the restaurant listings or search for that restaurant.
Tap on the restaurant to view details.
Expected Result:
Restaurants with no products or categories should not be displayed in the app until they are fully configured with menu items.

Impact:

Poor user experience due to encountering unusable restaurant profiles
Wasted time and frustration for users
Potential decrease in trust in app content quality

Start at the customer app's restaurant listings and search entry points, then trace how a restaurant's products, categories, and menu items are loaded. Confirm how an empty restaurant is represented before deciding where the display rule belongs. Done means restaurants without usable menu content are absent from listings and search, while configured restaurants remain available.

Written by the indexing model from the issue text.