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/adapters/tts/tencent_tts.py

@@ -90,7 +90,7 @@ class TencentTTSProvider:
             self._client = tts_client.TtsClient(cred, "", client_profile)
             return self._client
         except Exception as e:
-            logger.error("Tencent TTS client init failed: %s", e)
+            logger.error("Tencent TTS client init failed: {}", e)
             return None
 
     def _synthesize_sync(self, text: str, voice_type: int) -> bytes:
@@ -116,10 +116,10 @@ class TencentTTSProvider:
                 return b""
             return base64.b64decode(resp.Audio)
         except TencentCloudSDKException as e:
-            logger.error("Tencent TTS SDK error: %s", e)
+            logger.error("Tencent TTS SDK error: {}", e)
             return b""
         except Exception as e:
-            logger.error("Tencent TTS synthesize failed: %s", e)
+            logger.error("Tencent TTS synthesize failed: {}", e)
             return b""
 
     async def synthesize(self, text: str, voice: str = "alloy") -> bytes: