fix: 修复报错内容

app/config.py

@@ -34,6 +34,16 @@ class Settings(BaseSettings):
     wechat_appid: str | None = Field(default=None, alias="WECHAT_APPID")
     wechat_secret: str | None = Field(default=None, alias="WECHAT_SECRET")
     wechat_author: str = Field(default="AI 编辑部", alias="WECHAT_AUTHOR")
+    wechat_thumb_media_id: str | None = Field(
+        default=None,
+        alias="WECHAT_THUMB_MEDIA_ID",
+        description="草稿图文封面：永久素材 media_id（素材库或 add_material）。与 WECHAT_THUMB_IMAGE_PATH 二选一即可",
+    )
+    wechat_thumb_image_path: str | None = Field(
+        default=None,
+        alias="WECHAT_THUMB_IMAGE_PATH",
+        description="本地封面图路径（容器内），将自动上传为永久素材；不配则使用内置灰底图上传",
+    )
 
     im_webhook_url: str | None = Field(default=None, alias="IM_WEBHOOK_URL")
     im_secret: str | None = Field(default=None, alias="IM_SECRET")