feat: add diet entity and user lifestyle habits with data seeding support

backend/src/models/user/mod.rs

@@ -1,9 +1,11 @@
 //! User and session entities for authentication.
 
+pub mod diet;
 pub mod role;
 pub mod session;
 pub mod user;
 
+pub use diet::Entity as Diet;
 pub use role::Entity as Role;
 pub use session::Entity as Session;
 pub use user::Entity as User;