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

backend/src/models/user/user.rs

@@ -18,6 +18,9 @@ pub struct Model {
     #[sea_orm(unique)]
     pub email: String,
 
+    /// Foreign key to roles table
+    pub role_id: i32,
+
     pub created_at: DateTime,
     pub updated_at: DateTime,
 }
@@ -26,6 +29,13 @@ pub struct Model {
 pub enum Relation {
     #[sea_orm(has_many = "super::session::Entity")]
     Sessions,
+
+    #[sea_orm(
+        belongs_to = "super::role::Entity",
+        from = "Column::RoleId",
+        to = "super::role::Column::Id"
+    )]
+    Role,
 }
 
 impl Related<super::session::Entity> for Entity {
@@ -34,4 +44,11 @@ impl Related<super::session::Entity> for Entity {
     }
 }
 
+impl Related<super::role::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Role.def()
+    }
+}
+
 impl ActiveModelBehavior for ActiveModel {}
+