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/Calendars/CalendarService.cs

@@ -0,0 +1,92 @@
+namespace Health.Application.Calendars;
+
+public sealed class CalendarService(ICalendarRepository calendar) : ICalendarService
+{
+    private readonly ICalendarRepository _calendar = calendar;
+
+    public async Task<IReadOnlyList<object>> GetMonthAsync(Guid userId, int year, int month, CancellationToken ct)
+    {
+        var start = new DateOnly(year, month, 1);
+        var end = start.AddMonths(1);
+        var snapshot = await _calendar.GetSnapshotAsync(userId, start, end, ct);
+        var result = new List<object>();
+
+        for (var date = start; date < end; date = date.AddDays(1))
+        {
+            var entries = BuildEntries(snapshot, date);
+            if (entries.Count == 0) continue;
+
+            result.Add(new
+            {
+                date = date.ToString("yyyy-MM-dd"),
+                events = entries.Select(entry => entry.Type).Distinct().ToList(),
+                details = entries.Select(entry => entry.Value).ToList()
+            });
+        }
+
+        return result;
+    }
+
+    public async Task<object> GetDayAsync(Guid userId, DateOnly date, CancellationToken ct)
+    {
+        var snapshot = await _calendar.GetSnapshotAsync(userId, date, date.AddDays(1), ct);
+        var medications = snapshot.Medications
+            .Where(m => IsMedicationActiveOn(m, date))
+            .Select(m => new { m.Name, m.Dosage, timeOfDay = m.TimeOfDay.Select(t => t.ToString(@"hh\:mm")).ToList() })
+            .ToList();
+        var exercises = snapshot.ExercisePlans
+            .SelectMany(p => p.Items)
+            .Where(i => i.ScheduledDate == date && !i.IsRestDay)
+            .Select(i => new { type = i.ExerciseType, duration = i.DurationMinutes, isCompleted = i.IsCompleted, scheduledDate = i.ScheduledDate })
+            .ToList();
+        var followUps = snapshot.FollowUps
+            .Where(f => DateOnly.FromDateTime(f.ScheduledAt) == date)
+            .Select(f => new { f.Title, f.DoctorName, f.Department, status = f.Status.ToString() })
+            .ToList();
+
+        return new { medications, exercises, followUps };
+    }
+
+    private static List<CalendarEntry> BuildEntries(CalendarDataSnapshot snapshot, DateOnly date)
+    {
+        var entries = new List<CalendarEntry>();
+        foreach (var medication in snapshot.Medications.Where(m => IsMedicationActiveOn(m, date)))
+        {
+            entries.Add(new CalendarEntry("medication", new
+            {
+                type = "medication",
+                name = medication.Name,
+                dosage = medication.Dosage,
+                timeOfDay = medication.TimeOfDay.Select(t => t.ToString(@"hh\:mm")).ToList()
+            }));
+        }
+
+        foreach (var plan in snapshot.ExercisePlans)
+        {
+            foreach (var item in plan.Items.Where(i => i.ScheduledDate == date && !i.IsRestDay))
+                entries.Add(new CalendarEntry("exercise", new { type = "exercise", name = item.ExerciseType, duration = item.DurationMinutes, isCompleted = item.IsCompleted, scheduledDate = item.ScheduledDate }));
+        }
+
+        foreach (var followUp in snapshot.FollowUps.Where(f => DateOnly.FromDateTime(f.ScheduledAt) == date))
+        {
+            entries.Add(new CalendarEntry("followup", new
+            {
+                type = "followup",
+                title = followUp.Title,
+                doctorName = followUp.DoctorName,
+                department = followUp.Department,
+                status = followUp.Status.ToString()
+            }));
+        }
+
+        return entries;
+    }
+
+    private static bool IsMedicationActiveOn(Health.Domain.Entities.Medication medication, DateOnly date) =>
+        medication.IsActive
+        && medication.TimeOfDay.Count > 0
+        && (medication.StartDate == null || medication.StartDate <= date)
+        && (medication.EndDate == null || medication.EndDate >= date);
+
+    private sealed record CalendarEntry(string Type, object Value);
+}