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/Admin/Inbounds/PublishInboundCommand.cs

@@ -7,6 +7,5 @@ public sealed record PublishInboundCommand(
     Guid InboundId,
     bool IsPublished,
     string? DisplayName,
-    IReadOnlyList<Guid> AllowedRoleIds,
-    int? MaxClients
+    IReadOnlyList<Guid> AllowedRoleIds
 ) : ICommand<Result<InboundDto>>;