feat: 用药打卡全面重构 - 按次追踪 + 独立打卡页 + 任务区汇总

- 后端用药提醒改为按次粒度(每个服药时间独立判断)
- 新增 per-dose 打卡/取消打卡 API
- 新增 MedicationCheckInPage 独立打卡页(每药每时间单独toggle)
- 用药列表删底部弹窗(编辑/停药),点药品直接进该药打卡页
- 任务区用药汇总为一行(过期待服已服)
- 支持隔天(EveryOtherDay)/每周频率判断
- 删历史对话功能(ConversationItem + conversationListProvider + UI)

backend/src/Health.Infrastructure/AI/AgentHandlers/medication_agent_handler.cs

@@ -9,8 +9,16 @@ public static class MedicationAgentHandler
     {
         Function = new()
         {
-            Name = "manage_medication", Description = "用药管理",
-            Parameters = new { type = "object", properties = new { action = new { type = "string" }, name = new { type = "string" }, dosage = new { type = "string" } }, required = new[] { "action" } }
+            Name = "manage_medication", Description = "用药管理（创建/查询/确认服药）",
+            Parameters = new { type = "object", properties = new {
+                action = new { type = "string", description = "create/query/confirm" },
+                name = new { type = "string", description = "药品名称" },
+                dosage = new { type = "string", description = "剂量，如 100mg" },
+                frequency = new { type = "string", description = "频率，如 Daily/EveryOtherDay/Weekly" },
+                time_of_day = new { type = "array", items = new { type = "string" }, description = "服药时间，如 [\"08:00\",\"20:00\"]" },
+                duration_days = new { type = "integer", description = "服用天数" },
+                start_date = new { type = "string", description = "开始日期 yyyy-MM-dd" },
+            }, required = new[] { "action" } }
         }
     };
 
@@ -40,16 +48,43 @@ public static class MedicationAgentHandler
 
     private static async Task<object> CreateMedication(AppDbContext db, Guid userId, JsonElement args)
     {
+        var name = args.TryGetProperty("name", out var n) ? n.GetString()! : "";
+        var dosage = args.TryGetProperty("dosage", out var dg) ? dg.GetString() : null;
+        var frequencyStr = args.TryGetProperty("frequency", out var f) ? f.GetString() : "Daily";
+        var frequency = Enum.TryParse<MedicationFrequency>(frequencyStr, out var fr) ? fr : MedicationFrequency.Daily;
+
+        List<TimeOnly> times = [];
+        if (args.TryGetProperty("time_of_day", out var tod) && tod.ValueKind == JsonValueKind.Array)
+        {
+            foreach (var t in tod.EnumerateArray())
+            {
+                if (TimeOnly.TryParse(t.GetString(), out var parsed)) times.Add(parsed);
+            }
+        }
+
+        var durationDays = args.TryGetProperty("duration_days", out var dd) ? dd.GetInt32() : 0;
+        var startDateStr = args.TryGetProperty("start_date", out var sd) && sd.GetString() is string sds ? sds : null;
+
         var med = new Medication
         {
             Id = Guid.NewGuid(), UserId = userId,
-            Name = args.TryGetProperty("name", out var n) ? n.GetString()! : "",
-            Dosage = args.TryGetProperty("dosage", out var dg) ? dg.GetString() : null,
+            Name = name, Dosage = dosage, Frequency = frequency,
+            TimeOfDay = times.Count > 0 ? times : [new TimeOnly(8, 0)],
             Source = MedicationSource.AiEntry, IsActive = true,
+            StartDate = DateOnly.TryParse(startDateStr, out var parsedDate) ? parsedDate : DateOnly.FromDateTime(DateTime.Now),
+            EndDate = durationDays > 0 ? DateOnly.FromDateTime(DateTime.Now).AddDays(durationDays) : null,
         };
         db.Medications.Add(med);
         await db.SaveChangesAsync();
-        return new { success = true, medication_id = med.Id, med.Name };
+
+        var timeLabels = times.Count > 0 ? string.Join(", ", times.Select(t => t.ToString("HH:mm"))) : "08:00";
+        return new {
+            success = true, medication_id = med.Id,
+            name = med.Name, dosage = med.Dosage,
+            frequency = med.Frequency.ToString(), time = timeLabels,
+            start_date = med.StartDate?.ToString("yyyy-MM-dd"),
+            duration_days = durationDays,
+        };
     }
 
     private static async Task<object> QueryMedications(AppDbContext db, Guid userId)