feat(sub): add per-client subscription HWID limits (#5802)

* feat(sub): add per-client subscription HWID limits

* fix(sub): address HWID review on shared subId and bulk create

* fix(sub): store HWID devices by sub_id and drop anchor client workaround

* fix(sub): restore UA auto-detect and HTML page routing in subs()

The cherry-pick of the HWID gate onto main's refactored SUBController
had dropped main's UA-based format auto-detection and sub-page handling
from subs(). Restore those branches, slotting enforceHwid after the
HTML page and before format detection so the gate only applies to
machine-readable subscription bodies.

Also adapt tests to main's options-struct constructor and to the
ClientService.Update signature extended with limitHwid.

* fix(frontend): drop axios from HttpUtil.delete

The bulk-delete rework's committed version still referenced axios,
which this file no longer imports, breaking typecheck in CI. Use the
httpRequest wrapper like the other verbs.

---------

Co-authored-by: Sanaei <ho3ein.sanaei@gmail.com>

internal/web/translation/ja-JP.json

@@ -714,6 +714,13 @@
       "addClients": "クライアントを追加",
       "limitIp": "IP 制限",
       "limitIpDesc": "同時接続 IP の最大数。0 = 無制限。",
+      "limitHwid": "HWID 制限",
+      "limitHwidDesc": "サブスクリプション要求で登録できる最大デバイス数。0 = 無制限。",
+      "hwidLog": "HWID デバイス",
+      "hwidDevice": "登録済みデバイス",
+      "noHwids": "HWID デバイスはまだありません",
+      "firstSeen": "初回確認",
+      "lastSeen": "最終確認",
       "limitIpFail2banMissing": "Fail2ban がインストールされていないため、IP 制限を適用できません。このオプションを有効にするには、x-ui の bash メニューから Fail2ban をインストールしてください。",
       "limitIpFail2banWindows": "Windows では Fail2ban を利用できないため、IP 制限を適用できません。",
       "limitIpDisabled": "このサーバーでは IP 制限機能が無効になっています。",