refactor: unify system tools as resources

backend/services/node_specs.py

@@ -11,7 +11,6 @@ from services.message_policy import (
     MESSAGE_CONFIRMATION,
     MESSAGE_PLAYBACK,
 )
-from services.system_tools import SYSTEM_TOOL_KINDS, normalize_system_tools
 
 
 SPEC_VERSION = "3"
@@ -193,7 +192,7 @@ def _normalize_agent_data(data: dict[str, Any]) -> None:
     if data.get("entryMode") not in AGENT_ENTRY_MODES:
         data["entryMode"] = "wait_user"
     data.pop("entrySpeech", None)
-    data["systemTools"] = list(normalize_system_tools(data.get("systemTools")))
+    data.pop("systemTools", None)
     state_names = data.get("stateVariableNames")
     data["stateVariableNames"] = list(
         dict.fromkeys(str(name) for name in state_names or [] if str(name))
@@ -439,11 +438,6 @@ def validate_graph(graph: dict[str, Any]) -> list[str]:
             entry_mode = data.get("entryMode", "wait_user")
             if entry_mode not in AGENT_ENTRY_MODES:
                 errors.append(f"Agent 节点 {node_id} 的进入模式无效:{entry_mode}")
-            system_tools = data.get("systemTools", [])
-            if not isinstance(system_tools, list) or any(
-                tool not in SYSTEM_TOOL_KINDS for tool in system_tools
-            ):
-                errors.append(f"Agent 节点 {node_id} 的系统工具配置无效")
             state_names = data.get("stateVariableNames", [])
             if not isinstance(state_names, list) or any(
                 not isinstance(name, str) for name in state_names