feat: add audit and app log services

internal/services/auth_service.go

@@ -198,11 +198,7 @@ func (s *AuthService) recordAudit(actor string, action string, targetType string
 	if strings.TrimSpace(actor) == "" {
 		actor = "anonymous"
 	}
-	_, err := s.store.DB.Exec(`
-		INSERT INTO audit_logs (actor, action, target_type, target_id, detail, created_at)
-		VALUES (?, ?, ?, ?, ?, ?)
-	`, actor, action, targetType, targetID, detail, time.Now().UTC().Format(time.RFC3339))
-	return err
+	return recordAuditLog(s.store, actor, action, targetType, targetID, detail)
 }
 
 func scanAuthSession(row *sql.Row) (models.AuthSession, error) {