feat(ecommerce): use FormData binary upload instead of base64 dataUrl

- Add uploadAssetBinary method to aiGenerationClient (FormData + busboy)
- Replace base64 dataUrl upload in uploadProductImages with direct blob upload
  via /oss/upload-binary multipart endpoint
- This eliminates the DATA_URL_PATTERN regex parsing bug that produced
  44-byte corrupt files on OSS, causing DashScope "image format illegal" errors

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/api/aiGenerationClient.ts

@@ -403,6 +403,22 @@ export const aiGenerationClient = {
     return readJsonResponse<{ url: string; ossKey?: string }>(res, "Asset upload response failed");
   },
 
+  async uploadAssetBinary(blob: Blob, options?: { name?: string; mimeType?: string; scope?: string }): Promise<{ url: string; signedUrl?: string; ossKey?: string }> {
+    const form = new FormData();
+    form.append("file", blob, options?.name || "upload.png");
+    if (options?.scope) form.append("scope", options.scope);
+    if (options?.mimeType) form.append("mimeType", options.mimeType);
+    const res = await fetch(buildApiUrl("oss/upload-binary"), {
+      method: "POST",
+      headers: { ...buildAuthHeaders() },
+      body: form,
+    });
+    if (!res.ok) {
+      await throwResponseError(res, "Binary asset upload failed");
+    }
+    return readJsonResponse<{ url: string; ossKey?: string }>(res, "Binary asset upload response failed");
+  },
+
   async uploadAssetByUrl(input: UploadAssetByUrlInput): Promise<{ url: string; signedUrl?: string; ossKey?: string }> {
     const res = await fetch(buildApiUrl("oss/upload-by-url"), {
       method: "POST",

src/features/ecommerce/EcommercePage.tsx

@@ -1326,15 +1326,10 @@ function ProductClonePage(_props: ProductClonePageProps = {}) {
     for (const item of productImages) {
       try {
         const resp = await fetch(item.src);
-        const blob = await resp.blob();
+        const rawBlob = await resp.blob();
-        const mimeType = SUPPORTED_IMAGE_TYPES.has(blob.type) ? blob.type : "image/png";
+        const mimeType = SUPPORTED_IMAGE_TYPES.has(rawBlob.type) ? rawBlob.type : "image/png";
-        const dataUrl = await new Promise<string>((resolve, reject) => {
+        const blob = rawBlob.type === mimeType ? rawBlob : new Blob([rawBlob], { type: mimeType });
-          const reader = new FileReader();
+        const { url } = await aiGenerationClient.uploadAssetBinary(blob, { name: item.name, mimeType, scope: "ecommerce-product" });
-          reader.onload = () => resolve(String(reader.result));
-          reader.onerror = () => reject(reader.error);
-          reader.readAsDataURL(blob);
-        });
-        const { url } = await aiGenerationClient.uploadAsset({ dataUrl, name: item.name, mimeType });
         urls.push(url);
       } catch {
         // skip images that fail to upload