feat: organize tools and enable qwen realtime calls

backend/services/runtime_variables.py

@@ -181,6 +181,13 @@ class DynamicVariableStore:
             }
         return deepcopy(value)
 
+    def value(self, name: str) -> Primitive:
+        """Read one session value for an explicit ToolBinding source."""
+
+        if name.startswith("secret__"):
+            raise DynamicVariableError("ToolBinding 不能读取密钥变量")
+        return self._resolve(name, allow_secrets=False)
+
     def record(self, role: str, content: str, *, completed_agent_turn: bool = False) -> None:
         if content:
             self.history.append({"role": role, "message": content})