feat: 引入deepseek结构化输出

api/app/tasks/memoir_tasks.py

@@ -798,7 +798,11 @@ def generate_chapter_content(self, user_id: str, stage: str, new_content: str):
                     new_content=new_content,
                     existing_content=existing_content,
                 )
-                response = llm.invoke(prompt)
+                json_llm = llm.bind(
+                    model_kwargs={"response_format": {"type": "json_object"}},
+                    max_tokens=4096,
+                )
+                response = json_llm.invoke(prompt)
                 new_narrative = response.content.strip()
                 if _is_json_narrative(new_narrative):
                     narrative = new_narrative