refactor: unify system tools as resources

frontend/src/components/workflow/specs.ts

@@ -3,7 +3,7 @@
 import * as LucideIcons from "lucide-react";
 import { Circle, type LucideIcon } from "lucide-react";
 
-import type { NodeSpecDto, SystemToolKind, TurnConfig } from "@/lib/api";
+import type { NodeSpecDto, TurnConfig } from "@/lib/api";
 import { defaultTurnConfig } from "@/lib/turn-config";
 
 export type WorkflowNodeType =
@@ -41,7 +41,6 @@ export type WorkflowNodeData = {
   contextPolicy?: ContextPolicy;
   inheritGlobalConfig?: boolean;
   entryMode?: AgentEntryMode;
-  systemTools?: SystemToolKind[];
   stateVariableNames?: string[];
   toolIds?: string[];
   knowledgeBaseId?: string;
@@ -283,7 +282,6 @@ export function defaultGraph(): WorkflowGraph {
           contextPolicy: "inherit",
           inheritGlobalConfig: true,
           entryMode: "wait_user",
-          systemTools: [],
           stateVariableNames: [],
         },
       },