Enhance inbound management by removing MaxClients property

- Removed the MaxClients property from Inbound-related data models, including InboundDto and PublishInboundCommand.
- Updated related methods and handlers to reflect the removal of MaxClients, ensuring consistent behavior across the application.
- Adjusted API documentation and frontend components to remove references to MaxClients, streamlining the inbound publishing process.
- Enhanced logging in command handlers to handle node unavailability scenarios during user actions.
- Improved database schema and migrations to align with the updated data model.

backend/src/PnvPanel.Application/Configs/ConfigErrors.cs

@@ -25,4 +25,9 @@ public static class ConfigErrors
     );
 
     public static readonly Error NotFound = Error.NotFound("Configs.NotFound", "Конфиг не найден.");
+
+    public static readonly Error NodeUnavailable = Error.Failure(
+        "Configs.NodeUnavailable",
+        "Сервер временно недоступен. Попробуйте повторить операцию позже."
+    );
 }

backend/src/PnvPanel.Application/Configs/Create/CreateVpnConfigCommandHandler.cs

@@ -4,6 +4,7 @@ using PnvPanel.Application.Common.Interfaces;
 using PnvPanel.Application.Common.Messaging;
 using PnvPanel.Application.Common.Models;
 using PnvPanel.Domain.Configs;
+using PnvPanel.Domain.Nodes;
 
 namespace PnvPanel.Application.Configs.Create;
 
@@ -39,7 +40,7 @@ public sealed class CreateVpnConfigCommandHandler(
         var node = await dbContext
             .Nodes.AsNoTracking()
             .FirstOrDefaultAsync(n => n.Id == inbound.NodeId, cancellationToken);
-        if (node is null || !node.IsEnabled)
+        if (node is null || !node.IsEnabled || node.Status == NodeStatus.Offline)
             return Result.Failure<VpnConfigDto>(ConfigErrors.NodeDisabled);
 
         var config = VpnConfig.Create(userId, inbound.Id, inbound.Protocol, command.Label);

backend/src/PnvPanel.Application/Configs/Edit/EditVpnConfigCommandHandler.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
 using PnvPanel.Application.Auth;
 using PnvPanel.Application.Common.Interfaces;
 using PnvPanel.Application.Common.Messaging;
@@ -9,7 +10,8 @@ namespace PnvPanel.Application.Configs.Edit;
 public sealed class EditVpnConfigCommandHandler(
     IAppDbContext dbContext,
     IXuiPanelGateway gateway,
-    ICurrentUser currentUser
+    ICurrentUser currentUser,
+    ILogger<EditVpnConfigCommandHandler> logger
 ) : ICommandHandler<EditVpnConfigCommand, Result<VpnConfigDto>>
 {
     public async Task<Result<VpnConfigDto>> Handle(
@@ -35,23 +37,36 @@ public sealed class EditVpnConfigCommandHandler(
 
         if (command.Label is not null)
         {
-            config.Rename(command.Label);
-
             var node = await dbContext
                 .Nodes.AsNoTracking()
                 .FirstOrDefaultAsync(n => n.Id == inbound.NodeId, cancellationToken);
             if (node is not null)
             {
-                await gateway.UpdateClientAsync(
+                var updateResult = await gateway.UpdateClientAsync(
                     node,
                     inbound.RemoteInboundId,
                     config.ClientExternalId,
                     config.Protocol,
-                    config.Label ?? config.ClientEmail,
+                    command.Label,
                     enable: true,
                     cancellationToken
                 );
+
+                if (!updateResult.IsSuccess)
+                {
+                    // Нода недоступна — не переименовываем локально, иначе метка разойдётся
+                    // с тем, что реально хранится в 3x-ui. Пользователь может повторить.
+                    logger.LogWarning(
+                        "Failed to rename client for config {ConfigId} on node {NodeId}: {Error}",
+                        config.Id,
+                        node.Id,
+                        updateResult.Error
+                    );
+                    return Result.Failure<VpnConfigDto>(ConfigErrors.NodeUnavailable);
+                }
             }
+
+            config.Rename(command.Label);
         }
 
         return Result.Success(VpnConfigDto.FromDomain(config, inbound));

backend/src/PnvPanel.Application/Configs/Revoke/RevokeVpnConfigCommandHandler.cs

@@ -1,4 +1,5 @@
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
 using PnvPanel.Application.Auth;
 using PnvPanel.Application.Common.Interfaces;
 using PnvPanel.Application.Common.Messaging;
@@ -11,7 +12,8 @@ public sealed class RevokeVpnConfigCommandHandler(
     IAppDbContext dbContext,
     IXuiPanelGateway gateway,
     IRealtimeNotifier notifier,
-    ICurrentUser currentUser
+    ICurrentUser currentUser,
+    ILogger<RevokeVpnConfigCommandHandler> logger
 ) : ICommandHandler<RevokeVpnConfigCommand, Result>
 {
     public async Task<Result> Handle(
@@ -42,7 +44,8 @@ public sealed class RevokeVpnConfigCommandHandler(
                 .FirstOrDefaultAsync(n => n.Id == inbound.NodeId, cancellationToken);
 
         if (inbound is not null && node is not null)
-            await gateway.RemoveClientAsync(
+        {
+            var removeResult = await gateway.RemoveClientAsync(
                 node,
                 inbound.RemoteInboundId,
                 config.ClientExternalId,
@@ -50,6 +53,20 @@ public sealed class RevokeVpnConfigCommandHandler(
                 cancellationToken
             );
 
+            if (!removeResult.IsSuccess)
+            {
+                // Нода недоступна/сбой панели — не помечаем конфиг Revoked локально, иначе БД
+                // разойдётся с реальным состоянием клиента в 3x-ui. Пользователь может повторить.
+                logger.LogWarning(
+                    "Failed to remove client for config {ConfigId} on node {NodeId}: {Error}",
+                    config.Id,
+                    node.Id,
+                    removeResult.Error
+                );
+                return Result.Failure(ConfigErrors.NodeUnavailable);
+            }
+        }
+
         config.Revoke();
         await notifier.NotifyConfigStatusChangedAsync(
             userId,