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; }
+}

backend/F9WebAiTest.Application/Common/Exceptions/F9NotFoundException.cs

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+namespace F9WebAiTest.Application.Common.Exceptions;
+
+/// <summary>资源不存在异常</summary>
+public class F9NotFoundException : Exception
+{
+    public F9NotFoundException(string resourceName, object key)
+        : base($"{resourceName}不存在'{key}'。")
+    {
+    }
+
+    public F9NotFoundException(string message) : base(message) { }
+}

backend/F9WebAiTest.Application/Common/Exceptions/F9OperationException.cs

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+namespace F9WebAiTest.Application.Common.Exceptions;
+
+/// <summary>操作失败异常</summary>
+public class F9OperationException : Exception
+{
+    /// <summary>操作失败</summary>
+    /// <param name="resourceName">资源名称</param>
+    /// <param name="oporation">操作名称</param>
+    public F9OperationException(string resourceName, string oporation)
+        : base($"{resourceName}{oporation}失败。")
+    {
+    }
+
+    public F9OperationException(string message) : base(message) { }
+}

backend/F9WebAiTest.Application/Common/ServiceException.cs

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+namespace F9WebAiTest.Application.Common;
+
+/// <summary>业务异常</summary>
+public class ServiceException : Exception
+{
+    public int Code { get; set; } = 400;
+
+    public ServiceException(string message, int code = 400) : base(message)
+    {
+        Code = code;
+    }
+}