feat: 通知推送/免打扰偏好 + 饮食记录侧滑删除修复 + 聊天交互优化

- 通知: 新增推送开关/免打扰时段偏好持久化 + EF 迁移; 通知管线支持免打扰过滤
- 饮食: 侧滑删除 confirmDismiss 按方向放行(修复删不掉); 新增 diet_nutrition_widgets; 饮食录入页重构
- 聊天: 智能体胶囊点击锁防误触; 流式状态 select 优化; 卡片入场动画
- 主页: 消息列表提取 _HomeMessages + 侧滑手势打开抽屉
- 其他: api_client IP 适配; 通知/用药/饮食端点微调; 测试更新

backend/src/Health.WebApi/Endpoints/medication_endpoints.cs

@@ -36,8 +36,10 @@ public static class MedicationEndpoints
         group.MapDelete("/{id:guid}", async (Guid id, HttpContext http, IMedicationService medications, CancellationToken ct) =>
         {
             var userId = GetUserId(http);
-            await medications.DeleteAsync(userId, id, ct);
-            return Results.Ok(new { code = 0, data = new { success = true }, message = (string?)null });
+            var deleted = await medications.DeleteAsync(userId, id, ct);
+            return deleted
+                ? Results.Ok(new { code = 0, data = new { success = true }, message = (string?)null })
+                : Results.Ok(new { code = 40004, data = (object?)null, message = "用药记录不存在" });
         });
 
         group.MapPost("/{id:guid}/confirm", async (Guid id, HttpContext http, IMedicationService medications, CancellationToken ct) =>