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/Audit/AuditLogTests.cs

@@ -10,7 +10,14 @@ public class AuditLogTests
     {
         var actorId = Guid.NewGuid();
 
-        var log = AuditLog.Create(actorId, "user.blocked", "AppUser", actorId.ToString(), "{\"reason\":\"abuse\"}", AuditSource.Web);
+        var log = AuditLog.Create(
+            actorId,
+            "user.blocked",
+            "AppUser",
+            actorId.ToString(),
+            "{\"reason\":\"abuse\"}",
+            AuditSource.Web
+        );
 
         Assert.Equal(actorId, log.ActorId);
         Assert.Equal("user.blocked", log.Action);
@@ -24,7 +31,14 @@ public class AuditLogTests
     [Fact]
     public void Create_AllowsNullActorForSystemActions()
     {
-        var log = AuditLog.Create(null, "node.healthcheck", "Node", Guid.NewGuid().ToString(), null, AuditSource.System);
+        var log = AuditLog.Create(
+            null,
+            "node.healthcheck",
+            "Node",
+            Guid.NewGuid().ToString(),
+            null,
+            AuditSource.System
+        );
 
         Assert.Null(log.ActorId);
         Assert.Equal(AuditSource.System, log.Source);