fix(wireguard): emit UTC log timestamps

[Rerowros]

Summary

This pull request changes WireGuard log timestamps to use explicit UTC timestamps with a Z suffix.

The previous WireGuard log timestamp format used local time without timezone information. That made logs harder to compare with panel events, API events, and external monitoring systems.

WireGuard Logging

• Changed WireGuard log timestamp formatting to UTC with an explicit timezone suffix in backend/wireguard/log.go.
• Updated the lifecycle test expectation to match the new UTC timestamp format in backend/wireguard/wireguard_lifecycle_test.go.

Why This Is Better

Node logs are often compared with panel-side events when debugging traffic accounting, sync behavior, or node restarts. Local timestamps without timezone information make that comparison ambiguous.

Using UTC with Z makes ordering clear across machines, timezones, containers, and log collectors.

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