fix(toutiao): fail publish when body images fail to upload

Route content/cover images through the desktop media-image asset
pipeline and abort before submitting when any body image was not
replaced with a Toutiao-hosted URL, so we don't publish articles
that reference our own private asset endpoints.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/publisher-platforms/src/toutiao.ts

@@ -60,7 +60,7 @@ export interface ToutiaoPublishTransport {
   uploadHtmlImages(
     html: string,
     uploader: (sourceUrl: string) => Promise<string | null>,
-  ): Promise<{ html: string }>
+  ): Promise<{ html: string; uploaded?: Map<string, string> }>
   reportProgress?(stage: 'media_info' | 'upload_content_images' | 'upload_cover' | 'submit'): void
 }
 
@@ -77,10 +77,25 @@ export type ToutiaoPublishResult =
   | {
       success: false
       status: 'failed'
-      code: 'toutiaohao_not_logged_in' | 'article_content_empty' | 'toutiaohao_publish_failed'
+      code:
+        | 'toutiaohao_not_logged_in'
+        | 'article_content_empty'
+        | 'toutiaohao_image_upload_failed'
+        | 'toutiaohao_publish_failed'
       message: string
     }
 
+function extractHtmlImageSources(html: string): string[] {
+  const sources = new Set<string>()
+  for (const match of html.matchAll(/<img\b[^>]*src=(['"])(.*?)\1[^>]*>/gi)) {
+    const source = match[2]?.trim()
+    if (source) {
+      sources.add(source)
+    }
+  }
+  return [...sources]
+}
+
 export async function fetchToutiaoMediaSnapshot(
   fetchJson: <T>(input: string, init?: RequestInit) => Promise<T>,
 ): Promise<ToutiaoMediaSnapshot | null> {
@@ -246,6 +261,19 @@ export async function publishToutiaoArticle(
   const processed = await transport.uploadHtmlImages(normalizedHtml, async (sourceUrl) =>
     uploadContentImage(transport, sourceUrl),
   )
+  const contentImageSources = extractHtmlImageSources(normalizedHtml)
+  const uploadedSources = processed.uploaded ?? new Map<string, string>()
+  const missingUpload = contentImageSources.find(
+    (source) => !uploadedSources.has(source) && processed.html.includes(source),
+  )
+  if (missingUpload) {
+    return {
+      success: false,
+      status: 'failed',
+      code: 'toutiaohao_image_upload_failed',
+      message: `toutiaohao_image_upload_failed: ${missingUpload}`,
+    }
+  }
 
   transport.reportProgress?.('upload_cover')
   const cover = input.coverAssetUrl?.trim()