refactor(api): move workflow knowledge nodes and trigger nodes (#33445)

api/dify_graph/nodes/loop/loop_start_node.py

@@ -1,4 +1,4 @@
-from dify_graph.enums import NodeType, WorkflowNodeExecutionStatus
+from dify_graph.enums import BuiltinNodeTypes, WorkflowNodeExecutionStatus
 from dify_graph.node_events import NodeRunResult
 from dify_graph.nodes.base.node import Node
 from dify_graph.nodes.loop.entities import LoopStartNodeData
@@ -9,7 +9,7 @@ class LoopStartNode(Node[LoopStartNodeData]):
     Loop Start Node.
     """
 
-    node_type = NodeType.LOOP_START
+    node_type = BuiltinNodeTypes.LOOP_START
 
     @classmethod
     def version(cls) -> str: