first commit

backend/F9WebAiTest.Application/Common/ApiResult.cs

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+namespace F9WebAiTest.Application.Common;
+
+/// <summary>统一 API 响应</summary>
+public class ApiResult<T>
+{
+    public int Code { get; set; }
+    public string Message { get; set; }
+    public T Data { get; set; }
+
+    public static ApiResult<T> Ok(T data, string message = "success")
+        => new() { Code = 200, Message = message, Data = data };
+
+    public static ApiResult<T> Fail(string message, int code = 400)
+        => new() { Code = code, Message = message, Data = default };
+}
+
+/// <summary>分页结果</summary>
+public class PageResult<T>
+{
+    public List<T> Items { get; set; } = new();
+    public long Total { get; set; }
+    public int PageIndex { get; set; }
+    public int PageSize { get; set; }
+}