feat(recipes): add recipe visibility and sharing features

- Implemented functionality to set recipe visibility (public/private) with appropriate checks for user permissions.
- Added ability to share recipes with other users, including validation for existing users and permissions.
- Introduced new DTOs for setting visibility and sharing recipes.
- Updated RecipesController and RecipesService to handle new endpoints for visibility and sharing.
- Enhanced inventory preview to consider user permissions and shared recipes.
- Updated front-end to support new sharing and visibility features, including UI changes for recipe detail and admin user management.

backend/prisma/schema.prisma

@@ -16,6 +16,7 @@ model User {
   passwordHash String
   role         String       @default("user")
   isPremium    Boolean      @default(false)
+  canShareRecipes Boolean   @default(true)
   createdAt    DateTime     @default(now())
   updatedAt    DateTime     @updatedAt