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/src/PnvPanel.Infrastructure/Identity/AppRole.cs

@@ -18,11 +18,8 @@ public class AppRole : IdentityRole<Guid>
 
     public bool IsSystem { get; set; }
 
-    public AppRole()
-    {
-    }
+    public AppRole() { }
 
-    public AppRole(string name) : base(name)
-    {
-    }
+    public AppRole(string name)
+        : base(name) { }
 }