feat: 后端架构重构 — Endpoint→Service→Repository分层 + AI确认机制 + 异步任务持久化

- 核心业务拆分为 Endpoint → Application Service → Repository 三层
- AI写入操作必须用户确认后才写库(确认卡片机制)
- 报告/饮食/用药分析改为持久化任务队列(原子领取/重试/重启恢复)
- 运动计划修复: 连续真实日期替代周模板
- 用药提醒去重 + 通知Outbox预留
- 认证收拢到AuthService, 管理员收拢到AdminService
- AI会话加用户归属校验防串号
- 提示词调整为患者视角
- 开发假数据已关闭
- 21/21测试通过, 0警告0错误

backend/tests/Health.Tests/entity_tests.cs

@@ -204,10 +204,10 @@ public class EntityTests
         await db.SaveChangesAsync();
 
         var monday = new DateOnly(2026, 6, 1);
-        var plan = new ExercisePlan { Id = Guid.NewGuid(), UserId = user.Id, WeekStartDate = monday };
-        plan.Items.Add(new ExercisePlanItem { Id = Guid.NewGuid(), DayOfWeek = 0, ExerciseType = "散步", DurationMinutes = 30, IsCompleted = true, CompletedAt = DateTime.UtcNow });
-        plan.Items.Add(new ExercisePlanItem { Id = Guid.NewGuid(), DayOfWeek = 1, ExerciseType = "慢跑", DurationMinutes = 20 });
-        plan.Items.Add(new ExercisePlanItem { Id = Guid.NewGuid(), DayOfWeek = 2, IsRestDay = true });
+        var plan = new ExercisePlan { Id = Guid.NewGuid(), UserId = user.Id, StartDate = monday, EndDate = monday.AddDays(2), ReminderTime = new TimeOnly(19, 0) };
+        plan.Items.Add(new ExercisePlanItem { Id = Guid.NewGuid(), ScheduledDate = monday, ExerciseType = "散步", DurationMinutes = 30, IsCompleted = true, CompletedAt = DateTime.UtcNow });
+        plan.Items.Add(new ExercisePlanItem { Id = Guid.NewGuid(), ScheduledDate = monday.AddDays(1), ExerciseType = "慢跑", DurationMinutes = 20 });
+        plan.Items.Add(new ExercisePlanItem { Id = Guid.NewGuid(), ScheduledDate = monday.AddDays(2), IsRestDay = true });
         db.ExercisePlans.Add(plan);
         await db.SaveChangesAsync();