fix: close platform access re-review findings

backend/api/internal/logic/platform/access.go

@@ -80,3 +80,12 @@ func RequirePlatformMenuAccess() gin.HandlerFunc {
 		ctx.Next()
 	}
 }
+
+func requirePlatformRoot(ctx *gin.Context) bool {
+	claims, err := middleware.ParseAuth(ctx)
+	if err == nil && claims.Role == "root" {
+		return true
+	}
+	infra.Response.Error(ctx, errcode.ErrPermissionDenied)
+	return false
+}