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/src/Health.Application/HealthArchives/HealthArchiveContracts.cs

@@ -0,0 +1,39 @@
+using Health.Domain.Entities;
+
+namespace Health.Application.HealthArchives;
+
+public sealed record HealthArchiveDto(
+    Guid Id,
+    Guid UserId,
+    string? Diagnosis,
+    string? SurgeryType,
+    DateOnly? SurgeryDate,
+    IReadOnlyList<string> Allergies,
+    IReadOnlyList<string> DietRestrictions,
+    IReadOnlyList<string> ChronicDiseases,
+    string? FamilyHistory,
+    DateTime UpdatedAt);
+
+public sealed record HealthArchiveUpdateRequest(
+    string? Diagnosis,
+    string? SurgeryType,
+    DateOnly? SurgeryDate,
+    IReadOnlyList<string>? Allergies,
+    IReadOnlyList<string>? DietRestrictions,
+    IReadOnlyList<string>? ChronicDiseases,
+    string? FamilyHistory);
+
+public interface IHealthArchiveService
+{
+    Task<HealthArchiveDto?> GetAsync(Guid userId, CancellationToken ct);
+    Task<HealthArchiveDto> GetOrCreateAsync(Guid userId, CancellationToken ct);
+    Task<HealthArchiveDto> UpdateAsync(Guid userId, HealthArchiveUpdateRequest request, CancellationToken ct);
+    Task<object> ExecuteAiActionAsync(Guid userId, string action, HealthArchiveUpdateRequest request, CancellationToken ct);
+}
+
+public interface IHealthArchiveRepository
+{
+    Task<HealthArchive?> GetByUserIdAsync(Guid userId, CancellationToken ct);
+    Task AddAsync(HealthArchive archive, CancellationToken ct);
+    Task SaveChangesAsync(CancellationToken ct);
+}