feat: Sync traffic and expiry time for clients with the same subId
This feature syncs the traffic usage and expiry time for all clients that share the same subId.

When a client's traffic is updated, the new total traffic and expiry time are propagated to all other clients with the same subId. This is done in the addClientTraffic function.

When a client's settings are updated, specifically the expiry time, the new expiry time is propagated to all other clients with the same subId. This is done in the UpdateInboundClient function.

The changes are made in internal/web/service/inbound.go. Both the client_traffics table and the inbounds settings are updated to reflect the changes in the GUI.

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