Fix recipe steps display and DAG visualization

- Check multiple locations for nodes: dag.nodes, recipe.nodes, pipeline, steps
- Add dagre layout libraries for cytoscape DAG visualization
- Fix inputs parsing when stored as JSON string in Redis

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/services/run_service.py

@@ -114,6 +114,12 @@ class RunService:
                 task_actor_id = parsed.get("actor_id")
                 task_recipe = parsed.get("recipe")
                 task_inputs = parsed.get("inputs")
+                # Ensure inputs is a list (might be JSON string)
+                if isinstance(task_inputs, str):
+                    try:
+                        task_inputs = json.loads(task_inputs)
+                    except json.JSONDecodeError:
+                        task_inputs = None
                 task_output_name = parsed.get("output_name")
                 task_created_at = parsed.get("created_at")
             except json.JSONDecodeError: