feat(schema): restore complete Ent schema files

ent/schema/user_role.go

@@ -0,0 +1,34 @@
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+)
+
+// UserRole holds the schema definition for the UserRole entity (many-to-many relationship).
+type UserRole struct {
+	ent.Schema
+}
+
+// Fields of the UserRole.
+func (UserRole) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("user_id"),
+		field.String("role_id"),
+	}
+}
+
+// Edges of the UserRole.
+func (UserRole) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.To("user", User.Type).
+			Unique().
+			Required().
+			Field("user_id"),
+		edge.To("role", Role.Type).
+			Unique().
+			Required().
+			Field("role_id"),
+	}
+}