feat: route workflow image inputs natively

backend/services/workflow/agent.py

@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from typing import Any
+
 from models import AssistantConfig
 from pipecat.flows import ContextStrategy, ContextStrategyConfig, NodeConfig
 from pipecat.frames.frames import LLMUpdateSettingsFrame
@@ -106,7 +108,7 @@ class WorkflowAgentStage:
         node_id: str,
         *,
         functions: list,
-        leading_messages: list[dict[str, str]] | None = None,
+        leading_messages: list[dict[str, Any]] | None = None,
     ) -> NodeConfig:
         data = self._engine.data(node_id)
         strategy = (