修复回忆录图片重试状态透传与前端展示

api/services/pdf_service.py

@@ -15,7 +15,12 @@ from reportlab.pdfbase import pdfmetrics
 from reportlab.pdfbase.cidfonts import UnicodeCIDFont
 from services.memoir_images.parser import PLACEHOLDER_RE
 from services.memoir_images.schema import IMAGE_STATUS_COMPLETED, normalize_image_assets
-from services.memoir_images.storage import TencentCosStorageService, resolve_image_storage_key
+from services.memoir_images.storage import (
+    CosDownloadUrlError,
+    TencentCosStorageService,
+    mark_image_delivery_unavailable,
+    resolve_image_storage_key,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -53,8 +58,15 @@ def _prepare_pdf_image_assets(images: list[dict]) -> list[dict]:
         if asset.get("status") == IMAGE_STATUS_COMPLETED and storage_key:
             try:
                 asset["url"] = storage.get_download_url(storage_key)
+            except CosDownloadUrlError as exc:
+                logger.warning(
+                    "PDF 图片签名失败: key=%s, retryable=%s, request_id=%s, error=%s",
+                    storage_key, exc.retryable, exc.request_id, exc,
+                )
+                asset = mark_image_delivery_unavailable(asset)
             except Exception as exc:
-                logger.warning(f"PDF 图片签名失败: key={storage_key}, error={exc}")
+                logger.warning("PDF 图片签名失败: key=%s, error=%s", storage_key, exc)
+                asset = mark_image_delivery_unavailable(asset)
         prepared_assets.append(asset)
 
     return prepared_assets