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

backend/src/Health.WebApi/Program.cs

@@ -123,6 +123,7 @@ builder.Services.AddScoped<IDietRepository, EfDietRepository>();
 builder.Services.AddScoped<IDietImageAnalysisCoordinator, DietImageAnalysisCoordinator>();
 builder.Services.AddScoped<IDietImageAnalyzer, DietImageAnalyzer>();
 builder.Services.AddScoped<IDietImageAnalysisQueue, DietImageAnalysisQueue>();
+builder.Services.AddScoped<IAttachmentContextBuilder, AttachmentContextBuilder>();
 builder.Services.AddScoped<IExerciseService, ExerciseService>();
 builder.Services.AddScoped<IExerciseRepository, EfExerciseRepository>();
 builder.Services.AddScoped<IExerciseReminderProducer, ExerciseReminderProducer>();