feat: organize tools and enable qwen realtime calls

backend/services/workflow_engine.py

@@ -1,4 +1,4 @@
-"""Pure Workflow v3 graph queries and deterministic edge evaluation."""
+"""Pure Workflow v4 graph queries and deterministic edge evaluation."""
 
 from __future__ import annotations
 
@@ -25,8 +25,8 @@ class AgentStageConfig:
     vision_model_resource_id: str | None
     vision_prompt_mode: str
     vision_prompt: str
-    tool_ids: tuple[str, ...]
-    state_variable_names: tuple[str, ...]
+    tool_bindings: tuple[dict[str, Any], ...]
+    built_in_tools: dict[str, Any]
     knowledge_base_id: str | None
     knowledge_mode: str
     knowledge_top_n: int
@@ -155,16 +155,12 @@ class WorkflowEngine:
             ),
             vision_prompt_mode=str(source.get("visionPromptMode") or "runtime"),
             vision_prompt=str(source.get("visionPrompt") or "").strip(),
-            tool_ids=tuple(str(tool_id) for tool_id in source.get("toolIds") or []),
-            # Variable write scope always belongs to the Agent node, even when
-            # its selected tool resources come from Workflow defaults.
-            state_variable_names=tuple(
-                dict.fromkeys(
-                    str(name)
-                    for name in data.get("stateVariableNames") or []
-                    if str(name)
-                )
+            tool_bindings=tuple(
+                dict(binding)
+                for binding in source.get("toolBindings") or []
+                if isinstance(binding, dict) and binding.get("toolId")
             ),
+            built_in_tools=dict(source.get("builtInTools") or {}),
             knowledge_base_id=knowledge_base_id or None,
             knowledge_mode=(
                 str(source.get("knowledgeMode") or "automatic")