feat: 归档L03与L09审批发布能力

- 新增统一审批中心与审批管理页面，支持流程配置、审批详情与角色/用户审批对象

- 接入聊天助手、知识库、工作流的发布与删除审批，并补齐发布态校验与快照展示

easyflow-ui-admin/packages/tinyflow-ui/src/utils/sanitize.ts

@@ -0,0 +1,89 @@
+import { type Edge, type Node } from '@xyflow/svelte';
+
+import type { TinyflowData } from '#types';
+
+/**
+ * 清理节点中不适合序列化或预览的运行时字段。
+ */
+export function sanitizeNode(node: Node): Node {
+  const { id, type, position, data, parentId } = node;
+  return {
+    id,
+    type,
+    position: {
+      x: position?.x ?? 0,
+      y: position?.y ?? 0,
+    },
+    data: data ? JSON.parse(JSON.stringify(data)) : {},
+    ...(parentId !== undefined && { parentId }),
+  };
+}
+
+/**
+ * 清理边中不适合序列化或预览的运行时字段。
+ */
+export function sanitizeEdge(edge: Edge): Edge {
+  const { id, source, target, sourceHandle, targetHandle, type, data } = edge;
+  return {
+    id,
+    source,
+    target,
+    ...(sourceHandle !== undefined && { sourceHandle }),
+    ...(targetHandle !== undefined && { targetHandle }),
+    ...(type !== undefined && { type }),
+    data: data ? JSON.parse(JSON.stringify(data)) : {},
+  };
+}
+
+function sanitizeReadonlyNode(node: Node): Node {
+  const sanitized = sanitizeNode(node);
+  const nextData =
+    sanitized.data && typeof sanitized.data === 'object'
+      ? {
+          ...sanitized.data,
+          expand: false,
+        }
+      : {};
+  return {
+    ...sanitized,
+    data: nextData,
+  };
+}
+
+/**
+ * 为只读预览重建 tinyflow 数据，移除 viewport 和节点运行时几何状态。
+ */
+export function sanitizeTinyflowDataForReadonlyPreview(
+  input: TinyflowData | string,
+): null | TinyflowData | undefined {
+  let parsed: TinyflowData | undefined;
+  if (typeof input === 'string') {
+    const raw = input.trim();
+    if (!raw) {
+      return null;
+    }
+    try {
+      parsed = JSON.parse(raw);
+    } catch {
+      return undefined;
+    }
+  } else {
+    parsed = input;
+  }
+
+  if (!parsed || typeof parsed !== 'object' || Array.isArray(parsed)) {
+    return undefined;
+  }
+
+  const nodes = Array.isArray(parsed.nodes)
+    ? parsed.nodes.map((node) => sanitizeReadonlyNode(node as Node))
+    : [];
+  const edges = Array.isArray(parsed.edges)
+    ? parsed.edges.map((edge) => sanitizeEdge(edge as Edge))
+    : [];
+
+  return {
+    nodes,
+    edges,
+  };
+}