feat: AI 对话附件上下文解析 + 历史会话归档 + 多页面 UI 重构

- 后端: 新增 AttachmentContextBuilder 解析图片/PDF 摘要并拼入 LLM 上下文; ai_chat_endpoints 扩展附件接口; 新增 ReportAnalysisService
- 前端: 新增历史会话页与 conversation_history_provider; chat 链路支持附件展示与回放
- UI: 重构 medication_checkin / notification_center / profile / health_drawer 等多页面
- 配置: api_client baseUrl 适配当前 WiFi IP

health_app/lib/pages/consultation/consultation_pages.dart

@@ -143,7 +143,7 @@ class _DoctorChatPageState extends ConsumerState<DoctorChatPage> {
         margin: const EdgeInsets.only(bottom: 12),
         padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
         constraints: BoxConstraints(
-          maxWidth: MediaQuery.of(context).size.width * 0.82,
+          maxWidth: MediaQuery.sizeOf(context).width * 0.82,
         ),
         decoration: BoxDecoration(
           color: isUser ? AppTheme.primary : const Color(0xFFFEFEFF),