Enhance configuration and logging for user management commands

- Updated `.env.example` to include new settings for trusted proxies and networks for better security with X-Forwarded headers.
- Modified `BlockUserCommandHandler` and `UnblockUserCommandHandler` to include logging for gateway update failures, ensuring better traceability of issues during user blocking/unblocking.
- Adjusted tests for command handlers to incorporate logging functionality, improving test coverage and reliability.
- Updated frontend configuration to dynamically set the server port based on environment variables.

backend/tests/PnvPanel.Application.Tests/Admin/Users/UnblockUserCommandHandlerTests.cs

@@ -1,3 +1,4 @@
+using Microsoft.Extensions.Logging;
 using NSubstitute;
 using PnvPanel.Application.Admin.Users;
 using PnvPanel.Application.Common.Interfaces;
@@ -16,6 +17,7 @@ public class UnblockUserCommandHandlerTests
     private readonly IXuiPanelGateway _gateway = Substitute.For<IXuiPanelGateway>();
     private readonly IRealtimeNotifier _notifier = Substitute.For<IRealtimeNotifier>();
     private readonly ICurrentUser _currentUser = Substitute.For<ICurrentUser>();
+    private readonly ILogger<UnblockUserCommandHandler> _logger = Substitute.For<ILogger<UnblockUserCommandHandler>>();
 
     [Fact]
     public async Task Handle_WhenUnblockSucceeds_ReEnablesDisabledConfigsAndWritesAudit()
@@ -36,8 +38,12 @@ public class UnblockUserCommandHandlerTests
 
         _currentUser.UserId.Returns(adminId);
         _identityService.UnblockUserAsync(userId, Arg.Any<CancellationToken>()).Returns(Result.Success());
+        _gateway.UpdateClientAsync(
+            Arg.Any<Node>(), Arg.Any<string>(), Arg.Any<string>(), Arg.Any<VpnProtocol>(),
+            Arg.Any<string>(), Arg.Any<int>(), Arg.Any<bool>(), Arg.Any<CancellationToken>())
+            .Returns(Result.Success());
 
-        var handler = new UnblockUserCommandHandler(dbContext, _identityService, _gateway, _notifier, _currentUser);
+        var handler = new UnblockUserCommandHandler(dbContext, _identityService, _gateway, _notifier, _currentUser, _logger);
 
         var result = await handler.Handle(new UnblockUserCommand(userId), CancellationToken.None);
 
@@ -60,7 +66,7 @@ public class UnblockUserCommandHandlerTests
 
         _identityService.UnblockUserAsync(userId, Arg.Any<CancellationToken>()).Returns(Result.Failure(error));
 
-        var handler = new UnblockUserCommandHandler(dbContext, _identityService, _gateway, _notifier, _currentUser);
+        var handler = new UnblockUserCommandHandler(dbContext, _identityService, _gateway, _notifier, _currentUser, _logger);
 
         var result = await handler.Handle(new UnblockUserCommand(userId), CancellationToken.None);
 
@@ -68,4 +74,38 @@ public class UnblockUserCommandHandlerTests
         Assert.Equal(error, result.Error);
         Assert.Empty(dbContext.AuditLogs);
     }
+
+    [Fact]
+    public async Task Handle_GatewayFails_KeepsConfigDisabledForRetryAndDoesNotNotify()
+    {
+        using var dbContext = InMemoryDbContextFactory.Create();
+        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 inbound = Inbound.FromRemote(node.Id, "1", VpnProtocol.Vless, "remark", 443);
+        var config = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, "my-config", 0);
+        config.Disable();
+
+        dbContext.Nodes.Add(node);
+        dbContext.Inbounds.Add(inbound);
+        dbContext.VpnConfigs.Add(config);
+        await dbContext.SaveChangesAsync(CancellationToken.None);
+
+        _currentUser.UserId.Returns(adminId);
+        _identityService.UnblockUserAsync(userId, Arg.Any<CancellationToken>()).Returns(Result.Success());
+        _gateway.UpdateClientAsync(
+            Arg.Any<Node>(), Arg.Any<string>(), Arg.Any<string>(), Arg.Any<VpnProtocol>(),
+            Arg.Any<string>(), Arg.Any<int>(), Arg.Any<bool>(), Arg.Any<CancellationToken>())
+            .Returns(Result.Failure(Error.Failure("Xui.UpdateClientFailed", "Нода недоступна.")));
+
+        var handler = new UnblockUserCommandHandler(dbContext, _identityService, _gateway, _notifier, _currentUser, _logger);
+
+        var result = await handler.Handle(new UnblockUserCommand(userId), CancellationToken.None);
+
+        Assert.True(result.IsSuccess);
+        Assert.Equal(ConfigStatus.Disabled, config.Status);
+        await _notifier.DidNotReceive().NotifyConfigStatusChangedAsync(
+            Arg.Any<Guid>(), Arg.Any<Guid>(), Arg.Any<ConfigStatus>(), Arg.Any<CancellationToken>());
+    }
 }