feat(workflow): add edge-tool routing and realtime runtime

backend/services/workflow/agent.py

@@ -20,6 +20,11 @@ AGENT_STAGE_INSTRUCTION = (
     "工作流路由已在用户一轮输入结束时完成。只执行当前阶段任务，"
     "不要自行解释、模拟或宣布节点切换。"
 )
+EDGE_TOOL_STAGE_INSTRUCTION = (
+    "只执行当前阶段任务。若某个工作流跳转工具的条件已经明确满足，"
+    "必须只调用一个对应的 goto 工具，不要口头宣布、解释或模拟节点跳转。"
+    "若没有条件满足，则正常回答用户并停留在当前阶段。"
+)
 
 
 class WorkflowAgentStage:
@@ -43,9 +48,14 @@ class WorkflowAgentStage:
         stage = self._engine.agent_stage_config(node_id)
         if stage.vision_enabled:
             stage_prompt = f"{stage_prompt}\n\n[视觉能力]\n{VISION_SYSTEM_HINT}"
+        instruction = (
+            EDGE_TOOL_STAGE_INSTRUCTION
+            if self._engine.llm_routing_mode() == "edge_tool"
+            else AGENT_STAGE_INSTRUCTION
+        )
         return (
             f"{stage_prompt}\n\n[工作流执行规则]\n"
-            f"{AGENT_STAGE_INSTRUCTION}"
+            f"{instruction}"
         )
 
     async def refresh_prompt(self, node_id: str) -> None: