Replace '<3' with '❤️' in translations

Replace ASCII heart "<3" with Unicode heart emoji "❤️" in logout strings across translation files to improve visual consistency and rendering. Updated files in internal/web/translation for: ar-EG, en-US, es-ES, fa-IR, id-ID, ja-JP, pt-BR, ru-RU, tr-TR, uk-UA, vi-VN, zh-CN, and zh-TW.

internal/web/translation/zh-TW.json

@@ -6,7 +6,7 @@
   "cancel": "取消",
   "close": "關閉",
   "save": "儲存",
-  "logout": "登出 <3",
+  "logout": "登出 ❤️",
   "create": "建立",
   "add": "新增",
   "remove": "移除",