feat: Add music decryptor definition.

src/ZonyLrcTools.Cli/Commands/ToolCommand.cs

@@ -99,7 +99,7 @@ namespace ZonyLrcTools.Cli.Commands
                     Log.Logger.Error($"出现了未处理的异常，错误代码: {exception.ErrorCode}，错误信息: {ErrorCodeHelper.GetMessage(exception.ErrorCode)}\n调用栈:\n{exception.StackTrace}");
                     Environment.Exit(exception.ErrorCode);
                     return exception.ErrorCode;
-                case Exception unknownException:
+                case { } unknownException:
                     Log.Logger.Error($"出现了未处理的异常: {unknownException.Message}\n调用栈:\n{unknownException.StackTrace}");
                     Environment.Exit(-1);
                     return 1;

src/ZonyLrcTools.Cli/Infrastructure/MusicDecryption/IMusicDecryptor.cs

@@ -0,0 +1,17 @@
+using System.Threading.Tasks;
+
+namespace ZonyLrcTools.Cli.Infrastructure.MusicDecryption
+{
+    /// <summary>
+    /// 音乐解密器，用于将加密的歌曲数据，转换为可识别的歌曲格式。
+    /// </summary>
+    public interface IMusicDecryptor
+    {
+        /// <summary>
+        /// 将加密数据转换为可识别的歌曲格式。
+        /// </summary>
+        /// <param name="sourceBytes">源加密的歌曲数据。</param>
+        /// <returns>解密完成的歌曲数据。</returns>
+        Task<byte[]> Convert(byte[] sourceBytes);
+    }
+}

src/ZonyLrcTools.Cli/Infrastructure/MusicDecryption/NcmMusicDecryptor.cs

@@ -0,0 +1,13 @@
+using System.Threading.Tasks;
+using ZonyLrcTools.Cli.Infrastructure.DependencyInject;
+
+namespace ZonyLrcTools.Cli.Infrastructure.MusicDecryption
+{
+    public class NcmMusicDecryptor : IMusicDecryptor, ITransientDependency
+    {
+        public Task<byte[]> Convert(byte[] sourceBytes)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}