feat: refactor auth package and add get users for staff

internal/accessor/user/get_user_by_id.go

@@ -0,0 +1,24 @@
+package userrepository
+
+import (
+	"errors"
+
+	userdomain "legalgo-BE-go/internal/domain/user"
+)
+
+func (ur *accessor) GetUserByID(id string) (*userdomain.User, error) {
+	var user userdomain.User
+
+	if id == "" {
+		return nil, errors.New("id is empty")
+	}
+
+	if err := ur.db.
+		Preload("Subscribe").
+		Preload("Subscribe.SubscribePlan").
+		First(&user, "id = ?", id).Error; err != nil {
+		return nil, err
+	}
+
+	return &user, nil
+}