feat: Add user role entity and integrate with user model, including migration updates and a new Makefile target.

backend/src/models/user/mod.rs

@@ -1,7 +1,9 @@
 //! User and session entities for authentication.
 
+pub mod role;
 pub mod session;
 pub mod user;
 
+pub use role::Entity as Role;
 pub use session::Entity as Session;
 pub use user::Entity as User;