feat: refactor auth package and add get users for staff

internal/accessor/user/get_user_by_email.go

@@ -0,0 +1,25 @@
+package userrepository
+
+import (
+	"errors"
+	userdomain "legalgo-BE-go/internal/domain/user"
+
+	"gorm.io/gorm"
+)
+
+func (ur *accessor) GetUserByEmail(email string) (*userdomain.User, error) {
+	var user *userdomain.User
+
+	if email == "" {
+		return nil, errors.New("email is empty")
+	}
+
+	if err := ur.db.First(&user, "email = ?", email).Error; err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("user not found")
+		}
+		return nil, err
+	}
+
+	return user, nil
+}