fix: 修复多个问题

- JSON解析器字符串状态追踪修复
- AI客户端流式响应异常处理
- 写作风格MultipleResultsFound错误
- 职业stages字段类型处理
- 章节分析任务状态同步
- 后台任务返回值修复

backend/app/services/ai_clients/openai_client.py

@@ -60,7 +60,13 @@ class OpenAIClient(BaseAIClient):
         tool_choice: Optional[str] = None,
     ) -> Dict[str, Any]:
         payload = self._build_payload(messages, model, temperature, max_tokens, tools, tool_choice)
+        
+        logger.debug(f"📤 OpenAI 请求 payload: {json.dumps(payload, ensure_ascii=False, indent=2)}")
+        
         data = await self._request_with_retry("POST", "/chat/completions", payload)
+        
+        # 调试日志：输出原始响应
+        logger.debug(f"📥 OpenAI 原始响应: {json.dumps(data, ensure_ascii=False, indent=2)}")
 
         choices = data.get("choices", [])
         if not choices or len(choices) == 0:
@@ -83,19 +89,34 @@ class OpenAIClient(BaseAIClient):
     ) -> AsyncGenerator[str, None]:
         payload = self._build_payload(messages, model, temperature, max_tokens, stream=True)
         
-        async with await self._request_with_retry("POST", "/chat/completions", payload, stream=True) as response:
-            response.raise_for_status()
-            async for line in response.aiter_lines():
-                if line.startswith("data: "):
-                    data_str = line[6:]
-                    if data_str.strip() == "[DONE]":
-                        break
-                    try:
-                        data = json.loads(data_str)
-                        choices = data.get("choices", [])
-                        if choices and len(choices) > 0:
-                            content = choices[0].get("delta", {}).get("content", "")
-                            if content:
-                                yield content
-                    except json.JSONDecodeError:
-                        continue
+        try:
+            async with await self._request_with_retry("POST", "/chat/completions", payload, stream=True) as response:
+                response.raise_for_status()
+                try:
+                    async for line in response.aiter_lines():
+                        if line.startswith("data: "):
+                            data_str = line[6:]
+                            if data_str.strip() == "[DONE]":
+                                break
+                            try:
+                                data = json.loads(data_str)
+                                choices = data.get("choices", [])
+                                if choices and len(choices) > 0:
+                                    content = choices[0].get("delta", {}).get("content", "")
+                                    if content:
+                                        yield content
+                            except json.JSONDecodeError:
+                                continue
+                except GeneratorExit:
+                    # 生成器被关闭，这是正常的清理过程
+                    logger.debug("流式响应生成器被关闭(GeneratorExit)")
+                    raise
+                except Exception as iter_error:
+                    logger.error(f"流式响应迭代出错: {str(iter_error)}")
+                    raise
+        except GeneratorExit:
+            # 重新抛出GeneratorExit，让调用方处理
+            raise
+        except Exception as e:
+            logger.error(f"流式请求出错: {str(e)}")
+            raise