feat: 完善用户确认节点选项与输出流转

- 重构确认节点单选多选配置及输出参数契约

- 统一管理端、用户中心、匿名分享和公共接口恢复流程

- 增加保存校验、错误契约及交互测试

easyflow-ui-admin/packages/tinyflow-ui/src/store/stores.svelte.ts

@@ -10,6 +10,7 @@ export const createStore = () => {
   let edgesInternal = $state.raw([] as Edge[]);
   let viewport = $state.raw({ ...DEFAULT_VIEWPORT } as Viewport);
   let normalizeNode: TinyflowNodeNormalizer = (node) => node;
+  const pendingEditFlushers = new Set<() => void>();
 
   const normalizeNodes = (nodes: Node[]) => nodes.map(normalizeNode);
 
@@ -39,6 +40,13 @@ export const createStore = () => {
     setViewport: (v: Viewport) => {
       viewport = v;
     },
+    registerPendingEditFlusher: (flusher: () => void) => {
+      pendingEditFlushers.add(flusher);
+      return () => pendingEditFlushers.delete(flusher);
+    },
+    flushPendingEdits: () => {
+      [...pendingEditFlushers].forEach((flusher) => flusher());
+    },
 
     getNode: (id: string) => nodesInternal.find((node) => node.id === id),
     addNode: (node: Node) => {