Merge pull request '更新 📘 接口响应 Code 设计文档.md' (#7) from test into main

Reviewed-on: code/Chat#7

backend/IM_API/WeatherForecast.cs

@@ -0,0 +1,13 @@
+namespace IM_API
+{
+    public class WeatherForecast
+    {
+        public DateOnly Date { get; set; }
+
+        public int TemperatureC { get; set; }
+
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+        public string? Summary { get; set; }
+    }
+}