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/Reports/ReportContracts.cs

@@ -0,0 +1,83 @@
+using Health.Domain.Entities;
+using Health.Domain.Enums;
+
+namespace Health.Application.Reports;
+
+public sealed record ReportUploadFile(
+    string FileName,
+    long Length,
+    Stream Content);
+
+public sealed record ReportDto(
+    Guid Id,
+    Guid UserId,
+    string FileUrl,
+    string FileType,
+    string Category,
+    string Status,
+    string AiStatus,
+    string ReviewStatus,
+    string? Severity,
+    string? AiSummary,
+    string? AiIndicators,
+    string? DoctorComment,
+    string? DoctorRecommendation,
+    string? DoctorName,
+    DateTime? ReviewedAt,
+    DateTime CreatedAt);
+
+public sealed record ReportUploadResult(
+    bool Success,
+    int Code,
+    string? Message,
+    ReportDto? Report);
+
+public sealed record ReportAnalysisJob(
+    Guid TaskId,
+    Guid ReportId,
+    string FilePath);
+
+public sealed record StoredReportFile(
+    string FileUrl,
+    string FilePath);
+
+public interface IReportService
+{
+    Task<IReadOnlyList<ReportDto>> GetReportsAsync(Guid userId, CancellationToken ct);
+    Task<ReportDto?> GetReportAsync(Guid userId, Guid reportId, CancellationToken ct);
+    Task<ReportUploadResult> UploadReportAsync(Guid userId, ReportUploadFile file, CancellationToken ct);
+    Task<bool> DeleteReportAsync(Guid userId, Guid reportId, CancellationToken ct);
+    Task<bool> ReanalyzeReportAsync(Guid userId, Guid reportId, CancellationToken ct);
+}
+
+public interface IReportAnalysisQueue
+{
+    Task EnqueueAsync(ReportAnalysisJob job, CancellationToken ct = default);
+    Task RecoverStaleAsync(CancellationToken ct);
+    Task<ReportAnalysisJob?> TryTakeAsync(CancellationToken ct);
+    Task CompleteAsync(Guid taskId, CancellationToken ct);
+    Task RetryAsync(Guid taskId, string error, CancellationToken ct);
+}
+
+public interface IReportAnalysisService
+{
+    Task AnalyzeAsync(ReportAnalysisJob job, CancellationToken ct);
+}
+
+public interface IReportRepository
+{
+    Task<IReadOnlyList<Report>> ListAsync(Guid userId, CancellationToken ct);
+    Task<Report?> GetOwnedAsync(Guid userId, Guid reportId, CancellationToken ct);
+    Task<Report?> GetByIdAsync(Guid reportId, CancellationToken ct);
+    Task AddAsync(Report report, CancellationToken ct);
+    void Delete(Report report);
+    Task SaveChangesAsync(CancellationToken ct);
+}
+
+public interface IReportFileStorage
+{
+    Task<StoredReportFile> SaveAsync(ReportUploadFile file, string extension, CancellationToken ct);
+    string GetLocalFilePath(string fileUrl);
+    bool Exists(string filePath);
+    void Delete(string filePath);
+}