fix: 优化AI生成失败提示与素材失效处理

core/backend/apps/ops/serializers.py

@@ -7,6 +7,7 @@ class NotificationSerializer(serializers.ModelSerializer):
     type = serializers.CharField(source="notification_type", read_only=True)
     unread = serializers.SerializerMethodField()
     project_name = serializers.CharField(source="project.name", read_only=True)
+    brief = serializers.SerializerMethodField()
     body = serializers.SerializerMethodField()
     metadata = serializers.SerializerMethodField()
 
@@ -48,8 +49,27 @@ class NotificationSerializer(serializers.ModelSerializer):
     def get_unread(self, obj):
         return not obj.is_read
 
+    def _current_generation_message(self, obj):
+        metadata = obj.metadata if isinstance(obj.metadata, dict) else {}
+        error = metadata.get("generation_error")
+        if not isinstance(error, dict) or error.get("domain") != "generation":
+            return ""
+        from apps.ai.generation_errors import public_error_for_code
+
+        return public_error_for_code(
+            str(error.get("code") or "unknown"),
+            operation=str(error.get("operation") or "image_generate"),
+            reference_id=str(error.get("reference_id") or "") or None,
+        ).fallback_message
+
+    def get_brief(self, obj):
+        return self._current_generation_message(obj) or obj.brief or ""
+
     def get_body(self, obj):
         """兼容早期 AI 失败通知：不再向普通用户回传嵌入正文的上游原始异常。"""
+        current = self._current_generation_message(obj)
+        if current:
+            return current
         body = obj.body or ""
         marker = "—— 第三方服务商 API 返回的原始报错 ——"
         return body.split(marker, 1)[0].strip()