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.Application.Tests/Admin/Users/DeleteUserCommandHandlerTests.cs

@@ -24,13 +24,21 @@ public class DeleteUserCommandHandlerTests
         var adminId = Guid.NewGuid();
         _currentUser.UserId.Returns(adminId);
 
-        var handler = new DeleteUserCommandHandler(dbContext, _identityService, _gateway, _telegramNotifier, _currentUser);
+        var handler = new DeleteUserCommandHandler(
+            dbContext,
+            _identityService,
+            _gateway,
+            _telegramNotifier,
+            _currentUser
+        );
 
         var result = await handler.Handle(new DeleteUserCommand(adminId), CancellationToken.None);
 
         Assert.False(result.IsSuccess);
         Assert.Equal(UserErrors.CannotDeleteSelf, result.Error);
-        await _identityService.DidNotReceive().DeleteUserAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>());
+        await _identityService
+            .DidNotReceive()
+            .DeleteUserAsync(Arg.Any<Guid>(), Arg.Any<CancellationToken>());
     }
 
     [Fact]
@@ -40,7 +48,12 @@ public class DeleteUserCommandHandlerTests
         var userId = Guid.NewGuid();
         var adminId = Guid.NewGuid();
 
-        var node = Node.Register("node-1", new Uri("https://node1.example.com"), new NodeCredentials("admin", "protected"), null);
+        var node = Node.Register(
+            "node-1",
+            new Uri("https://node1.example.com"),
+            new NodeCredentials("admin", "protected"),
+            null
+        );
         var inbound = Inbound.FromRemote(node.Id, "1", VpnProtocol.Vless, "remark", 443);
         var config = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, "my-config");
         config.AssignRemoteClient("external-id");
@@ -51,20 +64,44 @@ public class DeleteUserCommandHandlerTests
         await dbContext.SaveChangesAsync(CancellationToken.None);
 
         _currentUser.UserId.Returns(adminId);
-        _gateway.RemoveClientAsync(Arg.Any<Node>(), Arg.Any<string>(), Arg.Any<string>(), Arg.Any<VpnProtocol>(), Arg.Any<CancellationToken>())
+        _gateway
+            .RemoveClientAsync(
+                Arg.Any<Node>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<VpnProtocol>(),
+                Arg.Any<CancellationToken>()
+            )
+            .Returns(Result.Success());
+        _identityService
+            .DeleteUserAsync(userId, Arg.Any<CancellationToken>())
             .Returns(Result.Success());
-        _identityService.DeleteUserAsync(userId, Arg.Any<CancellationToken>()).Returns(Result.Success());
 
-        var handler = new DeleteUserCommandHandler(dbContext, _identityService, _gateway, _telegramNotifier, _currentUser);
+        var handler = new DeleteUserCommandHandler(
+            dbContext,
+            _identityService,
+            _gateway,
+            _telegramNotifier,
+            _currentUser
+        );
 
         var result = await handler.Handle(new DeleteUserCommand(userId), CancellationToken.None);
 
         Assert.True(result.IsSuccess);
         Assert.Equal(ConfigStatus.Revoked, config.Status);
 
-        await _gateway.Received(1).RemoveClientAsync(
-            Arg.Is<Node>(n => n.Id == node.Id), inbound.RemoteInboundId, "external-id", config.Protocol, Arg.Any<CancellationToken>());
-        await _telegramNotifier.Received(1).NotifyUserAsync(userId, Arg.Any<string>(), Arg.Any<CancellationToken>());
+        await _gateway
+            .Received(1)
+            .RemoveClientAsync(
+                Arg.Is<Node>(n => n.Id == node.Id),
+                inbound.RemoteInboundId,
+                "external-id",
+                config.Protocol,
+                Arg.Any<CancellationToken>()
+            );
+        await _telegramNotifier
+            .Received(1)
+            .NotifyUserAsync(userId, Arg.Any<string>(), Arg.Any<CancellationToken>());
         await _identityService.Received(1).DeleteUserAsync(userId, Arg.Any<CancellationToken>());
 
         var audit = Assert.Single(dbContext.AuditLogs.Local);
@@ -79,15 +116,30 @@ public class DeleteUserCommandHandlerTests
         using var dbContext = InMemoryDbContextFactory.Create();
         var userId = Guid.NewGuid();
         _currentUser.UserId.Returns(Guid.NewGuid());
-        _identityService.DeleteUserAsync(userId, Arg.Any<CancellationToken>()).Returns(Result.Success());
+        _identityService
+            .DeleteUserAsync(userId, Arg.Any<CancellationToken>())
+            .Returns(Result.Success());
 
-        var handler = new DeleteUserCommandHandler(dbContext, _identityService, _gateway, _telegramNotifier, _currentUser);
+        var handler = new DeleteUserCommandHandler(
+            dbContext,
+            _identityService,
+            _gateway,
+            _telegramNotifier,
+            _currentUser
+        );
 
         var result = await handler.Handle(new DeleteUserCommand(userId), CancellationToken.None);
 
         Assert.True(result.IsSuccess);
-        await _gateway.DidNotReceive().RemoveClientAsync(
-            Arg.Any<Node>(), Arg.Any<string>(), Arg.Any<string>(), Arg.Any<VpnProtocol>(), Arg.Any<CancellationToken>());
+        await _gateway
+            .DidNotReceive()
+            .RemoveClientAsync(
+                Arg.Any<Node>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<VpnProtocol>(),
+                Arg.Any<CancellationToken>()
+            );
     }
 
     [Fact]
@@ -96,9 +148,17 @@ public class DeleteUserCommandHandlerTests
         using var dbContext = InMemoryDbContextFactory.Create();
         var userId = Guid.NewGuid();
         _currentUser.UserId.Returns(Guid.NewGuid());
-        _identityService.DeleteUserAsync(userId, Arg.Any<CancellationToken>()).Returns(Result.Failure(UserErrors.NotFound));
+        _identityService
+            .DeleteUserAsync(userId, Arg.Any<CancellationToken>())
+            .Returns(Result.Failure(UserErrors.NotFound));
 
-        var handler = new DeleteUserCommandHandler(dbContext, _identityService, _gateway, _telegramNotifier, _currentUser);
+        var handler = new DeleteUserCommandHandler(
+            dbContext,
+            _identityService,
+            _gateway,
+            _telegramNotifier,
+            _currentUser
+        );
 
         var result = await handler.Handle(new DeleteUserCommand(userId), CancellationToken.None);