feat(wordcloud): 贴纸持久化（决策#4）+ dispatchOrder/persistDesignMedia 辅助

src/pages/diy/index.tsx

@@ -4,6 +4,7 @@ import { useState, useEffect } from 'react'
 import './index.scss'
 import { getProductById } from '../../utils/productConfig'
 import { getDesignList, setDesignList, updateDesign, type DesignItem, type StickerItem } from '../../utils/store'
+import { persistDesignMedia } from '../../utils/api'
 import { useThemeContext } from '../../context/ThemeContext'
 import { useSafeArea } from '../../hooks/useSafeArea'
 import { useStatusBar } from '../../hooks/useStatusBar'
@@ -241,18 +242,15 @@ export default function DIYPage() {
     return base
   }
 
-  const handleComplete = () => {
+  const handleComplete = async () => {
     if (hasOverlap) {
       Taro.showToast({ title: '贴纸不能重叠', icon: 'none' })
       return
     }
     if (designId) {
-      updateDesign(designId, {
-        designData: {
-          stickers,
-          category
-        }
-      })
+      // 贴纸/底图持久化（决策#4，R4 负责）：本地图 → COS 持久 URL，保证后端 WCD 打包可下载素材
+      const data = await persistDesignMedia({ stickers, category, version: 1 })
+      updateDesign(designId, { designData: data })
     }
     setPreviewMode(false)
     Taro.navigateTo({ url: `/pages/checkout/index?designId=${designId}` })

src/utils/api/upload.ts

@@ -2,7 +2,10 @@ import Taro from '@tarojs/taro'
 import http, { BASE_URL, getToken } from '../request'
 import type {
   CosCredentials,
+  DesignDataV1,
   SketchResult,
+  StickerItem,
+  WordCloudDispatchResult,
   WordCloudJob,
   WordCloudStatus,
 } from '../../types'
@@ -101,4 +104,49 @@ export function getWordCloudResult(jobId: string): Promise<{ imageUrl: string; s
   return http.get<{ imageUrl: string; svgUrl?: string }>(`/api/wordcloud/jobs/${jobId}/result`)
 }
 
+/** 是否为设备本地临时路径（后端/wordcloud 无法消费，需先转 COS 持久 URL） */
+function isLocalPath(url?: string): boolean {
+  return !!url && /^(wxfile:|http:\/\/tmp\/|tmp\/)/i.test(url)
+}
+
+/** 单张本地图 → COS 持久 URL；COS 未配置等失败时保留原路径，不阻断保存 */
+async function persistLocalImage(localPath: string): Promise<string> {
+  try {
+    const key = `uploads/sticker/${Date.now()}_${Math.floor(Math.random() * 1e6)}.jpg`
+    const cred = await getUploadCredentials(key)
+    return await uploadToCos(localPath, cred)
+  } catch {
+    return localPath
+  }
+}
+
+/**
+ * 设计媒体持久化（契约 design-data-contract-v1.md 决策#4：贴纸持久化由 R4 完成）。
+ * 保存/下单前调用，把 designData 里的本地贴纸/底图上传为 COS 持久 URL 写回 src，
+ * 保证 WCD 打包时后端能下载到素材字节。
+ */
+export async function persistDesignMedia(designData: DesignDataV1): Promise<DesignDataV1> {
+  if (!designData) return designData
+  const next: DesignDataV1 = { ...designData }
+  if (designData.background && isLocalPath(designData.background.src)) {
+    next.background = {
+      ...designData.background,
+      src: await persistLocalImage(designData.background.src),
+    }
+  }
+  if (designData.stickers && designData.stickers.length) {
+    const list: StickerItem[] = []
+    for (const s of designData.stickers) {
+      list.push(isLocalPath(s.src) ? { ...s, src: await persistLocalImage(s.src) } : s)
+    }
+    next.stickers = list
+  }
+  return next
+}
+
+/** 下单后 WCD 派单（幂等触发；WORDCLOUD 未配置返回 not_configured，见 api-contract §8） */
+export function dispatchOrder(orderId: string): Promise<WordCloudDispatchResult> {
+  return http.post<WordCloudDispatchResult>(`/api/orders/${orderId}/dispatch`)
+}
+
 export type { WordCloudStatus }