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/HealthRecords/HealthRecordService.cs

@@ -0,0 +1,116 @@
+using Health.Domain.Entities;
+using Health.Domain.Enums;
+
+namespace Health.Application.HealthRecords;
+
+public sealed class HealthRecordService(IHealthRecordRepository records) : IHealthRecordService
+{
+    private readonly IHealthRecordRepository _records = records;
+
+    public async Task<IReadOnlyList<HealthRecordDto>> GetRecordsAsync(Guid userId, string? type, int? days, CancellationToken ct)
+    {
+        HealthMetricType? metricType = null;
+        if (!string.IsNullOrEmpty(type) && Enum.TryParse<HealthMetricType>(type, ignoreCase: true, out var parsed))
+            metricType = parsed;
+
+        var recordedAfter = days.HasValue ? DateTime.UtcNow.AddDays(-days.Value) : (DateTime?)null;
+        var result = await _records.ListAsync(userId, metricType, recordedAfter, 100, ct);
+        return result.Select(ToDto).ToList();
+    }
+
+    public async Task<Guid> CreateAsync(Guid userId, HealthRecordUpsertRequest request, CancellationToken ct)
+    {
+        var record = new HealthRecord
+        {
+            Id = Guid.NewGuid(),
+            UserId = userId,
+            MetricType = request.Type,
+            Systolic = request.Systolic,
+            Diastolic = request.Diastolic,
+            Value = request.Value,
+            Unit = request.Unit,
+            Source = request.Source,
+            RecordedAt = request.RecordedAt ?? DateTime.UtcNow,
+            CreatedAt = DateTime.UtcNow,
+            IsAbnormal = HealthRecordRules.CheckAbnormal(request),
+        };
+
+        await _records.AddAsync(record, ct);
+        await _records.SaveChangesAsync(ct);
+        return record.Id;
+    }
+
+    public async Task<bool> UpdateAsync(Guid userId, Guid id, HealthRecordUpsertRequest request, CancellationToken ct)
+    {
+        var record = await _records.GetOwnedAsync(userId, id, ct);
+        if (record == null) return false;
+
+        record.MetricType = request.Type;
+        record.Systolic = request.Systolic;
+        record.Diastolic = request.Diastolic;
+        record.Value = request.Value;
+        record.Unit = request.Unit;
+        record.Source = request.Source;
+        record.RecordedAt = request.RecordedAt ?? record.RecordedAt;
+        record.IsAbnormal = HealthRecordRules.CheckAbnormal(request);
+
+        await _records.SaveChangesAsync(ct);
+        return true;
+    }
+
+    public async Task<bool> DeleteAsync(Guid userId, Guid id, CancellationToken ct)
+    {
+        var record = await _records.GetOwnedAsync(userId, id, ct);
+        if (record == null) return false;
+
+        _records.Delete(record);
+        await _records.SaveChangesAsync(ct);
+        return true;
+    }
+
+    public async Task<Dictionary<string, object?>> GetLatestAsync(Guid userId, CancellationToken ct)
+    {
+        var types = new[]
+        {
+            HealthMetricType.BloodPressure,
+            HealthMetricType.HeartRate,
+            HealthMetricType.Glucose,
+            HealthMetricType.SpO2,
+            HealthMetricType.Weight
+        };
+
+        var result = new Dictionary<string, object?>();
+        foreach (var type in types)
+        {
+            var latest = await _records.GetLatestByTypeAsync(userId, type, ct);
+            result[type.ToString()] = latest == null ? null : new
+            {
+                latest.Systolic,
+                latest.Diastolic,
+                latest.Value,
+                latest.Unit,
+                latest.RecordedAt
+            };
+        }
+
+        return result;
+    }
+
+    public async Task<IReadOnlyList<object>> GetTrendAsync(Guid userId, HealthMetricType type, int period, CancellationToken ct)
+    {
+        var days = period switch { 7 => 7, 30 => 30, 90 => 90, _ => 7 };
+        var records = await _records.GetTrendAsync(userId, type, DateTime.UtcNow.AddDays(-days), ct);
+        return records.Select(r => new { r.Id, r.Systolic, r.Diastolic, r.Value, r.IsAbnormal, r.RecordedAt }).Cast<object>().ToList();
+    }
+
+    public static HealthRecordDto ToDto(HealthRecord record) => new(
+        record.Id,
+        record.MetricType.ToString(),
+        record.Systolic,
+        record.Diastolic,
+        record.Value,
+        record.Unit,
+        record.Source.ToString(),
+        record.IsAbnormal,
+        record.RecordedAt);
+}