[Feat]: Client bandwidth, traffic limits, and prioritization in wg-easy UI

Description

It would be great to have per-client network management directly in the wg-easy UI, including: • Bandwidth limits (max upload/download per client) • Traffic quotas (total traffic per client over a period) • Prioritization / QoS for clients

Suggested Solution

Implement a UI section in wg-easy where an admin can: • Assign upload/download limits per client. • Set traffic quotas per client over a period (daily, weekly, monthly). • Define priority/QoS levels for clients. The backend could use Linux tc or iptables/nftables to enforce these limits automatically when a client connects.

Alternatives

No response

Additional Context

No response