feat: login service and implement database storage

internal/services/auth/login_as_staff.go

@@ -0,0 +1,21 @@
+package serviceauth
+
+import (
+	"errors"
+
+	"github.com/ardeman/project-legalgo-go/internal/utilities/utils"
+)
+
+func (sv *LoginStaffSvc) LoginAsStaff(email string) (string, error) {
+	staff, err := sv.staffAcs.GetStaff(email)
+	if err != nil {
+		return "", errors.New(err.Error())
+	}
+
+	token, err := utils.GenerateToken2(staff.Email)
+	if err != nil {
+		return "", errors.New(err.Error())
+	}
+
+	return token, nil
+}