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/Configs/Revoke/RevokeVpnConfigCommandHandlerTests.cs

@@ -21,7 +21,12 @@ public class RevokeVpnConfigCommandHandlerTests
         using var dbContext = InMemoryDbContextFactory.Create();
         var userId = 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, null);
         config.AssignRemoteClient("external-id");
@@ -31,15 +36,37 @@ public class RevokeVpnConfigCommandHandlerTests
         dbContext.VpnConfigs.Add(config);
         await dbContext.SaveChangesAsync(CancellationToken.None);
 
-        var handler = new RevokeVpnConfigCommandHandler(dbContext, _gateway, _notifier, FakeCurrentUser.Authenticated(userId));
+        var handler = new RevokeVpnConfigCommandHandler(
+            dbContext,
+            _gateway,
+            _notifier,
+            FakeCurrentUser.Authenticated(userId)
+        );
 
-        var result = await handler.Handle(new RevokeVpnConfigCommand(config.Id), CancellationToken.None);
+        var result = await handler.Handle(
+            new RevokeVpnConfigCommand(config.Id),
+            CancellationToken.None
+        );
 
         Assert.True(result.IsSuccess);
         Assert.Equal(ConfigStatus.Revoked, config.Status);
-        await _gateway.Received(1).RemoveClientAsync(
-            Arg.Any<Node>(), inbound.RemoteInboundId, "external-id", config.Protocol, Arg.Any<CancellationToken>());
-        await _notifier.Received(1).NotifyConfigStatusChangedAsync(userId, config.Id, ConfigStatus.Revoked, Arg.Any<CancellationToken>());
+        await _gateway
+            .Received(1)
+            .RemoveClientAsync(
+                Arg.Any<Node>(),
+                inbound.RemoteInboundId,
+                "external-id",
+                config.Protocol,
+                Arg.Any<CancellationToken>()
+            );
+        await _notifier
+            .Received(1)
+            .NotifyConfigStatusChangedAsync(
+                userId,
+                config.Id,
+                ConfigStatus.Revoked,
+                Arg.Any<CancellationToken>()
+            );
     }
 
     [Fact]
@@ -56,13 +83,28 @@ public class RevokeVpnConfigCommandHandlerTests
         dbContext.VpnConfigs.Add(config);
         await dbContext.SaveChangesAsync(CancellationToken.None);
 
-        var handler = new RevokeVpnConfigCommandHandler(dbContext, _gateway, _notifier, FakeCurrentUser.Authenticated(userId));
+        var handler = new RevokeVpnConfigCommandHandler(
+            dbContext,
+            _gateway,
+            _notifier,
+            FakeCurrentUser.Authenticated(userId)
+        );
 
-        var result = await handler.Handle(new RevokeVpnConfigCommand(config.Id), CancellationToken.None);
+        var result = await handler.Handle(
+            new RevokeVpnConfigCommand(config.Id),
+            CancellationToken.None
+        );
 
         Assert.True(result.IsSuccess);
-        await _gateway.DidNotReceive().RemoveClientAsync(
-            Arg.Any<PnvPanel.Domain.Nodes.Node>(), Arg.Any<string>(), Arg.Any<string>(), Arg.Any<VpnProtocol>(), Arg.Any<CancellationToken>());
+        await _gateway
+            .DidNotReceive()
+            .RemoveClientAsync(
+                Arg.Any<PnvPanel.Domain.Nodes.Node>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<VpnProtocol>(),
+                Arg.Any<CancellationToken>()
+            );
     }
 
     [Fact]
@@ -71,9 +113,17 @@ public class RevokeVpnConfigCommandHandlerTests
         using var dbContext = InMemoryDbContextFactory.Create();
         var userId = Guid.NewGuid();
 
-        var handler = new RevokeVpnConfigCommandHandler(dbContext, _gateway, _notifier, FakeCurrentUser.Authenticated(userId));
+        var handler = new RevokeVpnConfigCommandHandler(
+            dbContext,
+            _gateway,
+            _notifier,
+            FakeCurrentUser.Authenticated(userId)
+        );
 
-        var result = await handler.Handle(new RevokeVpnConfigCommand(Guid.NewGuid()), CancellationToken.None);
+        var result = await handler.Handle(
+            new RevokeVpnConfigCommand(Guid.NewGuid()),
+            CancellationToken.None
+        );
 
         Assert.False(result.IsSuccess);
         Assert.Equal(ConfigErrors.NotFound, result.Error);
@@ -84,9 +134,17 @@ public class RevokeVpnConfigCommandHandlerTests
     {
         using var dbContext = InMemoryDbContextFactory.Create();
 
-        var handler = new RevokeVpnConfigCommandHandler(dbContext, _gateway, _notifier, FakeCurrentUser.Anonymous());
+        var handler = new RevokeVpnConfigCommandHandler(
+            dbContext,
+            _gateway,
+            _notifier,
+            FakeCurrentUser.Anonymous()
+        );
 
-        var result = await handler.Handle(new RevokeVpnConfigCommand(Guid.NewGuid()), CancellationToken.None);
+        var result = await handler.Handle(
+            new RevokeVpnConfigCommand(Guid.NewGuid()),
+            CancellationToken.None
+        );
 
         Assert.False(result.IsSuccess);
         Assert.Equal(PnvPanel.Application.Auth.AuthErrors.Unauthorized, result.Error);