fix(conversation): 离屏不丢回复、列表预热 WS 与非阻塞进入聊天

- 后端：文本/转写后 AI 生成改为独立任务，避免断连取消整轮；按需 TTS 等与 WS 改动
- 前端：RealtimeSession 重绑 UI 时恢复流式 buffer；列表 onPressIn/挂载预热、已有会话立即 push
- 同步会话相关类型、i18n、测试与 env/资源等累计改动

Co-authored-by: Cursor <cursoragent@cursor.com>

api/app/features/conversation/session_history.py

@@ -18,6 +18,7 @@ def conversation_messages_to_redis_history(
             "content": row.content,
             "messageType": row.message_type,
             "timestamp": row.created_at.isoformat() if row.created_at else None,
+            "durableMessageId": row.id,
         }
         if row.voice_session_id:
             item["voiceSessionId"] = row.voice_session_id