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.Application/Exercises/ExerciseService.cs

@@ -97,6 +97,10 @@ public sealed class ExerciseService(IExerciseRepository exercises) : IExerciseSe
     {
         var item = await _exercises.GetOwnedItemAsync(userId, itemId, ct);
         if (item == null) return null;
+        if (item.ScheduledDate != BeijingToday())
+            throw new ValidationException("只能打卡今天的运动任务");
+        if (item.IsRestDay)
+            throw new ValidationException("休息日无需打卡");
         item.IsCompleted = !item.IsCompleted;
         item.CompletedAt = item.IsCompleted ? DateTime.UtcNow : null;
         item.Plan.UpdatedAt = DateTime.UtcNow;
@@ -108,6 +112,10 @@ public sealed class ExerciseService(IExerciseRepository exercises) : IExerciseSe
     {
         var item = await _exercises.GetOwnedItemAsync(userId, itemId, ct);
         if (item == null) return false;
+        if (item.ScheduledDate != BeijingToday())
+            throw new ValidationException("只能打卡今天的运动任务");
+        if (item.IsRestDay)
+            throw new ValidationException("休息日无需打卡");
         item.IsCompleted = true;
         item.CompletedAt = DateTime.UtcNow;
         item.Plan.UpdatedAt = DateTime.UtcNow;