feat: Support newline configuration.

实装换行符配置项。

src/ZonyLrcTools.Cli/Infrastructure/Lyric/LyricItemCollection.cs

@@ -104,8 +104,8 @@ namespace ZonyLrcTools.Cli.Infrastructure.Lyric
         public override string ToString()
         {
             var lyricBuilder = new StringBuilder();
-            ForEach(lyric => lyricBuilder.Append(lyric).Append("\r\n"));
+            ForEach(lyric => lyricBuilder.Append(lyric).Append(Option.LineBreak));
-            return lyricBuilder.ToString().TrimEnd("\r\n");
+            return lyricBuilder.ToString().TrimEnd(Option.LineBreak);
         }
     }
 }

tests/ZonyLrcTools.Tests/Infrastructure/Lyric/LyricCollectionTests.cs

@@ -0,0 +1,25 @@
+using Shouldly;
+using Xunit;
+using ZonyLrcTools.Cli.Infrastructure.Lyric;
+
+namespace ZonyLrcTools.Tests.Infrastructure.Lyric
+{
+    public class LyricCollectionTests : TestBase
+    {
+        [Fact]
+        public void LyricCollectionLineBreak_Test()
+        {
+            var lyricObject = new LyricItemCollection(new LyricItemCollectionOption
+            {
+                IsOneLine = false,
+                LineBreak = LineBreakType.MacOs
+            })
+            {
+                new(0, 20, "你好世界!"),
+                new(0, 22, "Hello World!")
+            };
+            
+            lyricObject.ToString().ShouldContain(LineBreakType.MacOs);
+        }
+    }
+}