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/routers/recipes.py

@@ -155,10 +155,18 @@ async def get_recipe(
         "output": "#f59e0b",
     }
 
-    # Get nodes from dag - can be list or dict
+    # Get nodes from dag - can be list or dict, can be under "dag" or directly on recipe
     dag = recipe.get("dag", {})
     nodes = dag.get("nodes", [])
 
+    # Also check for nodes directly on recipe (alternative formats)
+    if not nodes:
+        nodes = recipe.get("nodes", [])
+    if not nodes:
+        nodes = recipe.get("pipeline", [])
+    if not nodes:
+        nodes = recipe.get("steps", [])
+
     # Convert list of nodes to steps format
     if isinstance(nodes, list):
         for node in nodes: