feat: 引入 EF Core Migrations + 后台任务/校验修复 + 前端四态

后端
- 改用 EF Core Migrations(InitialCreate),Program.cs 用 MigrateAsync + AUTO_MIGRATE 开关 + 显式 MigrationsAssembly;移除 EnsureCreated、删除手写 DatabaseSchemaMigrator
- 修复后台任务永久卡 Processing:三个队列对超时且达上限的任务原子标记 Failed
- 修复报告重试失效:基础设施异常向上抛激活 RetryAsync,停机取消不计失败
- 修复 AI 用药天数 off-by-one(结束日为包含式)
- AI 报告日志不再记录 VLM 健康正文
- 新增统一输入校验(ValidationException + 中间件映射 400):血压/心率/血糖/血氧/体重范围、药名/日期/服药时间去重、饮食热量与评分、运动时长上限
- 删除健康数据 AI 录入的影子直写路径,统一走 Service 校验

前端
- 新增 AppErrorState / AppFutureView,用药列表、服药打卡、运动计划、随访列表改为 加载/失败/空/数据 四态,失败可重试

瘦身
- 删除过时的 DataSeeder / DevDataSeeder 及调用
- 删除依赖实时服务的 ai_agent_tests 集成测试

backend/src/Health.Application/Exercises/ExerciseService.cs

@@ -1,9 +1,11 @@
+using Health.Domain;
 using Health.Domain.Entities;
 
 namespace Health.Application.Exercises;
 
 public sealed class ExerciseService(IExerciseRepository exercises) : IExerciseService
 {
+    private const int MaxDurationMinutes = 1440;  // 单次运动时长上限 24 小时
     private static readonly TimeOnly DefaultReminderTime = new(19, 0);
     private readonly IExerciseRepository _exercises = exercises;
 
@@ -17,6 +19,8 @@ public sealed class ExerciseService(IExerciseRepository exercises) : IExerciseSe
 
     public async Task<Guid> CreateAsync(Guid userId, ExercisePlanCreateRequest request, CancellationToken ct)
     {
+        ValidateDuration(request.DurationMinutes);
+
         var startDate = request.StartDate;
         var endDate = request.EndDate < startDate ? startDate : request.EndDate;
         if (endDate.DayNumber - startDate.DayNumber > 365)
@@ -39,6 +43,9 @@ public sealed class ExerciseService(IExerciseRepository exercises) : IExerciseSe
 
     public async Task<Guid> CreateFromItemsAsync(Guid userId, DateOnly startDate, DateOnly endDate, TimeOnly? reminderTime, IReadOnlyList<ExercisePlanItemInput> items, CancellationToken ct)
     {
+        foreach (var item in items)
+            ValidateDuration(item.DurationMinutes);
+
         var normalizedEnd = endDate < startDate ? startDate : endDate;
         var plan = NewPlan(userId, startDate, normalizedEnd, reminderTime);
         foreach (var item in items.Where(x => x.ScheduledDate >= startDate && x.ScheduledDate <= normalizedEnd).GroupBy(x => x.ScheduledDate).Select(x => x.First()))
@@ -55,6 +62,13 @@ public sealed class ExerciseService(IExerciseRepository exercises) : IExerciseSe
         return plan.Id;
     }
 
+    // 时长上限校验：下限交由各方法兜底为 30，这里只拦截不合理的超大值
+    private static void ValidateDuration(int durationMinutes)
+    {
+        if (durationMinutes > MaxDurationMinutes)
+            throw new ValidationException($"单次运动时长不能超过 {MaxDurationMinutes} 分钟（24 小时），当前值 {durationMinutes} 不合理");
+    }
+
     public async Task<IReadOnlyList<ExercisePlanSummaryDto>> ListAsync(Guid userId, CancellationToken ct)
     {
         var plans = await _exercises.ListAsync(userId, 20, ct);