Default: only show ingredients, recipes that fit coaching niches (especially for whitelabel apps)

For niche coaches with white-label apps, it would be ideal if ingredients could be pre-scoped based on niche/diet type (e.g., vegan, keto, carni, paleo, etc.).

So, not filtering in the UI, but making irrelevant ingredients and recipes invisible within the app altogether (e.g., a vegan app contains only vegan content in all lists, search results, and suggestions).

This prevents confusion and makes the experience fully consistent with the coach's chosen niche.