feat(api+app): 对话阶段化、回忆录流水线与客户端会话体验

- DB: segments 用户输入文本（Alembic 0002）
- Chat: 阶段检测/阶段提示/回复限制，编排与访谈/画像 prompts 调整
- Memoir: 忠实度检查 agent，叙事与分类等链路更新
- Core: agent 日志、Alembic 启动、LangChain/日志/配置等
- Story: time_hints；Memory 检索与相关测试
- Expo: 助手头像、会话页与消息拆分、实时会话与文案/i18n
- Docs/scripts/tests: 迁移脚本、LLM JSON/记忆检索文档、新增单测

api/app/features/payment/wechat_client.py

@@ -175,7 +175,7 @@ class WeChatPayClient:
                     "sign": pay_params,
                     "packageValue": "Sign=WXPay",
                 }
-                logger.info("微信支付预订单创建成功: %s", out_trade_no)
+                logger.info("微信支付预订单创建成功: {}", out_trade_no)
                 return PaymentResult(
                     success=True,
                     payment_method="wechat",
@@ -188,7 +188,7 @@ class WeChatPayClient:
         except PaymentCreateError:
             raise
         except Exception as e:
-            logger.error("微信支付预订单创建异常: %s", e)
+            logger.error("微信支付预订单创建异常: {}", e)
             raise PaymentCreateError(f"微信支付下单异常: {e}")
 
     def verify_notify(self, headers: Dict[str, str], body: str) -> NotifyResult:
@@ -213,7 +213,7 @@ class WeChatPayClient:
         except PaymentNotifyError:
             raise
         except Exception as e:
-            logger.error("微信支付回调处理异常: %s", e)
+            logger.error("微信支付回调处理异常: {}", e)
             raise PaymentNotifyError(f"微信支付回调处理失败: {e}")
 
     def query_order(self, out_trade_no: str) -> PaymentStatus:
@@ -238,7 +238,7 @@ class WeChatPayClient:
         except PaymentQueryError:
             raise
         except Exception as e:
-            logger.error("查询微信支付订单异常: %s", e)
+            logger.error("查询微信支付订单异常: {}", e)
             raise PaymentQueryError(f"查询微信支付订单异常: {e}")
 
     def close_order(self, out_trade_no: str) -> bool:
@@ -246,12 +246,12 @@ class WeChatPayClient:
         try:
             code, message = self._client.close(out_trade_no=out_trade_no)
             if code in range(200, 300):
-                logger.info("微信支付订单已关闭: %s", out_trade_no)
+                logger.info("微信支付订单已关闭: {}", out_trade_no)
                 return True
-            logger.warning("关闭微信支付订单失败: %s - %s", code, message)
+            logger.warning("关闭微信支付订单失败: {} - {}", code, message)
             return False
         except Exception as e:
-            logger.error("关闭微信支付订单异常: %s", e)
+            logger.error("关闭微信支付订单异常: {}", e)
             return False
 
     def _get_pay_type(self):