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/Nodes/NodeTests.cs

@@ -11,7 +11,12 @@ public class NodeTests
     [Fact]
     public void Register_WithAbsoluteUri_CreatesEnabledUnknownStatusNode()
     {
-        var node = Node.Register("Germany-1", new Uri("https://de1.example.com:2053"), Credentials, "Germany");
+        var node = Node.Register(
+            "Germany-1",
+            new Uri("https://de1.example.com:2053"),
+            Credentials,
+            "Germany"
+        );
 
         Assert.Equal("Germany-1", node.Name);
         Assert.Equal("Germany", node.Location);
@@ -25,13 +30,20 @@ public class NodeTests
     {
         var relativeUri = new Uri("de1.example.com", UriKind.Relative);
 
-        Assert.Throws<DomainException>(() => Node.Register("Germany-1", relativeUri, Credentials, null));
+        Assert.Throws<DomainException>(() =>
+            Node.Register("Germany-1", relativeUri, Credentials, null)
+        );
     }
 
     [Fact]
     public void UpdateDetails_ChangesNameAndLocation()
     {
-        var node = Node.Register("Old", new Uri("https://example.com"), Credentials, "Old location");
+        var node = Node.Register(
+            "Old",
+            new Uri("https://example.com"),
+            Credentials,
+            "Old location"
+        );
 
         node.UpdateDetails("New", "New location");