fix(sockopt): honor trustedXForwardedFor on gRPC inbounds (xray v26.6.22) (#5503)

* fix(sockopt): honor trustedXForwardedFor on gRPC inbounds

xray-core v26.6.22 (commit 711aea4) switched the gRPC server from reading
the x-real-ip gRPC metadata to resolving the client IP from X-Forwarded-For
via sockopt.trustedXForwardedFor, matching ws/httpupgrade/xhttp.

The panel already exposed the trustedXForwardedFor field and wire output, but
the per-transport gate (TRUSTED_HEADER_NETWORKS) still omitted grpc. On a gRPC
inbound this raised a false "transport does not honor this header" warning and
mis-flagged the Cloudflare real-client-IP preset. Add grpc to the gate.

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

* docs(i18n): note gRPC in trustedXForwardedFor hint (all locales)

Follow-up to the gRPC gate fix: the trustedXForwardedForHint tooltip across
all 13 locales said the header is honored "only on WebSocket, HTTPUpgrade and
XHTTP". xray-core v26.6.22 added gRPC, so list it too.

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

---------

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

internal/web/translation/zh-TW.json

@@ -562,7 +562,7 @@
         "tcpCongestion": "TCP Congestion",
         "dialerProxy": "Dialer Proxy",
         "trustedXForwardedFor": "信任的 X-Forwarded-For",
-        "trustedXForwardedForHint": "信任此請求標頭以取得真實用戶端 IP（例如 Cloudflare CDN 後的 CF-Connecting-IP）。僅在 WebSocket、HTTPUpgrade 和 XHTTP 傳輸上生效。留空則忽略轉發標頭。",
+        "trustedXForwardedForHint": "信任此請求標頭以取得真實用戶端 IP（例如 Cloudflare CDN 後的 CF-Connecting-IP）。僅在 WebSocket、HTTPUpgrade、XHTTP 和 gRPC 傳輸上生效。留空則忽略轉發標頭。",
         "proxyProtocolHint": "接受 PROXY protocol 標頭，從上游 L4 隧道或中繼（HAProxy、gost、nginx-stream、Xray dokodemo-door）或 Cloudflare Spectrum 取得真實用戶端 IP。上游必須傳送 PROXY protocol。適用於 TCP、WebSocket、HTTPUpgrade 和 gRPC；不適用於 mKCP。",
         "realClientIp": "真實用戶端 IP",
         "realClientIpHint": "當流量透過 CDN 或中繼到達此入站時，取得訪客的真實 IP，而非記錄中間節點的位址。選擇一個預設以自動填入下方對應的 sockopt 欄位。這些欄位絕不會在訂閱中傳送給用戶端。",