feat:修复执行过程编排中初始分支删除单个节点bug

backend/server.py

@@ -2807,14 +2807,39 @@ def handle_delete_task_process_node(data):
                                         nodes = branch.get('nodes', [])
                                         tasks = branch.get('tasks', [])
 
-                                        # 找到并删除节点
-                                        for i, node in enumerate(nodes):
+                                        # 找到要删除的节点
+                                        node_to_delete = None
+                                        for node in nodes:
                                             if node.get('id') == node_id:
-                                                nodes.pop(i)
-                                                if i < len(tasks):
-                                                    tasks.pop(i)
+                                                node_to_delete = node
                                                 break
 
+                                        if node_to_delete:
+                                            # 从 nodes 中删除
+                                            nodes = [n for n in nodes if n.get('id') != node_id]
+
+                                            # 从 tasks 中删除：使用 originalIndex 精确匹配
+                                            # nodes 包含 root 节点，所以 agent 节点的 originalIndex 对应 tasks 的索引
+                                            node_data = node_to_delete.get('data', {})
+                                            original_index = node_data.get('originalIndex')
+
+                                            if original_index is not None and 0 <= original_index < len(tasks):
+                                                tasks.pop(original_index)
+                                            else:
+                                                # 降级方案：使用 agentName + actionType 匹配
+                                                agent_name = node_data.get('agentName')
+                                                action_type_key = node_data.get('actionTypeKey', '').lower()
+                                                action_type_map = {
+                                                    'propose': 'Propose',
+                                                    'review': 'Critique',
+                                                    'improve': 'Improve',
+                                                    'summary': 'Finalize'
+                                                }
+                                                target_action_type = action_type_map.get(action_type_key, action_type_key)
+                                                tasks = [t for t in tasks
+                                                        if not (t.get('AgentName') == agent_name
+                                                                and t.get('ActionType') == target_action_type)]
+
                                         # 更新分支数据（包括 nodes, tasks, edges）
                                         branch['nodes'] = nodes
                                         branch['tasks'] = tasks