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/tests/PnvPanel.Application.Tests/Configs/GetMyConfigs/GetMyConfigsQueryHandlerTests.cs

@@ -22,7 +22,7 @@ public class GetMyConfigsQueryHandlerTests
         var otherUserId = Guid.NewGuid();
 
         var inbound = Inbound.FromRemote(Guid.NewGuid(), "1", VpnProtocol.Vless, "remark", 443);
-        inbound.Publish("My inbound", [], null);
+        inbound.Publish("My inbound", []);
 
         var activeConfig = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, "Active");
         var revokedConfig = VpnConfig.Create(userId, inbound.Id, VpnProtocol.Vless, "Revoked");