fix: Use correct field 'label' instead of 'name' for node display

- Frontend saves node name as 'label' (workflowSerializer.js:19)
- Changed WorkflowNode.name to WorkflowNode.label
- Changed node.name to node.label in workflow_executor.py
- Priority: node.label > prompt_slug > node_type-id
- Verified against frontend serialization code

backend/workflow_executor.py

@@ -167,8 +167,8 @@ async def execute_workflow(
             )
 
             # Add human-readable label to node_state for debug UI
-            # Priority: node.name (user-defined) > prompt_slug > node_type-id
-            node_label = node.name if hasattr(node, 'name') and node.name else (
+            # Priority: node.label (user-defined) > prompt_slug > node_type-id
+            node_label = node.label if hasattr(node, 'label') and node.label else (
                 node.prompt_slug if hasattr(node, 'prompt_slug') and node.prompt_slug else f"{node.type.value}-{node_id[:8]}"
             )
             if not node_state.debug_prompt_slug:

backend/workflow_models.py

@@ -196,7 +196,7 @@ class WorkflowNode(BaseModel):
     """
     id: str = Field(..., description="Eindeutige Knoten-ID")
     type: NodeType = Field(..., description="Knotentyp")
-    name: Optional[str] = Field(None, description="Node-Name (vom Editor)")
+    label: Optional[str] = Field(None, description="Node-Label (vom Editor, z.B. 'Qualitätseinschätzung')")
     position: Optional[Position] = Field(None, description="Position im visuellen Editor")
 
     # ANALYSIS-Knoten