fix 文档管理模块 & 法规对话模块

backend/app/infrastructure/storage/json_document_repository.py

@@ -75,6 +75,15 @@ class JsonDocumentRepository(DocumentRepository):
         documents.sort(key=lambda item: item.updated_at, reverse=True)
         return documents[:limit] if limit is not None else documents
 
+    def delete(self, doc_id: str) -> bool:
+        """Delete a document record."""
+        payload = self._load()
+        if doc_id not in payload:
+            return False
+        del payload[doc_id]
+        self._save(payload)
+        return True
+
     def update_status(
         self,
         doc_id: str,