细节优化

backend/app/services/doc_service.py

@@ -156,10 +156,26 @@ class DocumentService:
         doc = self.get_or_404(doc_id, user)
         file_size = doc.file_size
         self._doc_repo.delete(doc)
+        self._delete_doc_files(doc)
         # 回补配额
         self._restore_quota(user, file_size)
         self._session.commit()
 
+    def _delete_doc_files(self, doc: Document) -> None:
+        """物理删除文档的原始文件与 Markdown 文件（软删后调用）。"""
+        from app.storage.local_storage import get_storage
+
+        storage = get_storage()
+        for key in (doc.storage_path, doc.markdown_path):
+            if not key:
+                continue
+            try:
+                storage.delete(key)
+            except Exception as exc:  # noqa: BLE001
+                import logging
+
+                logging.getLogger(__name__).warning("清理文件失败 key=%s: %s", key, exc)
+
     def _check_quota(self, user: User, file_size: int) -> None:
         settings = get_settings()
         if user.storage_used + file_size > settings.default_storage_quota: