refactor(wireguard): drop removed workers field (xray v26.6.22) (#5509)

* v3.4.0

* refactor(wireguard): drop removed `workers` field (xray v26.6.22)

xray-core v26.6.22 (PR #6287) removed the WireGuard `workers` (num_workers)
config field; the engine now relies on wireguard-go's internal worker
fallback and no longer reads it. Remove it from the panel so it stops
emitting a key xray ignores.

Removed from the inbound/outbound/outbound-form WireGuard schemas, both
WireGuard forms, the outbound form adapter (both directions) and defaults,
the two affected tests, and the `workers` label in all 13 locales. Existing
configs that still carry workers are simply dropped on parse — no migration
needed since the field had no runtime effect.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* Update version

---------

Co-authored-by: MHSanaei <ho3ein.sanaei@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/web/translation/vi-VN.json

@@ -1489,7 +1489,6 @@
         "overrideXrayPrivateIp": "Ghi đè chặn IP riêng mặc định của Xray",
         "blockDelay": "Trễ chặn (ms)",
         "reverseSniffing": "Sniffing ngược",
-        "workers": "Workers",
         "reserved": "Đã đặt trước",
         "minUploadInterval": "Khoảng upload tối thiểu (ms)",
         "maxUploadSizeBytes": "Kích thước upload tối đa (byte)",