Refactor project files for improved readability and structure

- Cleaned up whitespace in Directory.Build.props and Directory.Packages.props for consistency.
- Reformatted project file references in PnvPanel.Api.csproj for better clarity.
- Enhanced code readability in various endpoint files by adjusting line breaks and indentation.
- Standardized method signatures and improved formatting in ResultExtensions and multiple endpoint classes for better maintainability.

backend/tests/PnvPanel.Domain.Tests/Apps/ClientAppTests.cs

@@ -8,7 +8,14 @@ public class ClientAppTests
     [Fact]
     public void Create_SetsEnabledByDefault()
     {
-        var app = ClientApp.Create("v2rayNG", new Uri("https://play.google.com/store/apps/details?id=x"), OsPlatform.Android, "desc", null, 1);
+        var app = ClientApp.Create(
+            "v2rayNG",
+            new Uri("https://play.google.com/store/apps/details?id=x"),
+            OsPlatform.Android,
+            "desc",
+            null,
+            1
+        );
 
         Assert.Equal("v2rayNG", app.Name);
         Assert.Equal(OsPlatform.Android, app.OperatingSystem);
@@ -19,9 +26,24 @@ public class ClientAppTests
     [Fact]
     public void Update_ReplacesAllMutableFields()
     {
-        var app = ClientApp.Create("Old", new Uri("https://old.example.com"), OsPlatform.IOS, "old", "old-icon", 1);
+        var app = ClientApp.Create(
+            "Old",
+            new Uri("https://old.example.com"),
+            OsPlatform.IOS,
+            "old",
+            "old-icon",
+            1
+        );
 
-        app.Update("New", new Uri("https://new.example.com"), OsPlatform.MacOS, "new", "new-icon", 2, isEnabled: false);
+        app.Update(
+            "New",
+            new Uri("https://new.example.com"),
+            OsPlatform.MacOS,
+            "new",
+            "new-icon",
+            2,
+            isEnabled: false
+        );
 
         Assert.Equal("New", app.Name);
         Assert.Equal(new Uri("https://new.example.com"), app.DownloadUrl);