feat: Add Codex OAuth FAST mode toggle (#2210)

* Add Codex OAuth FAST mode toggle

* fix(codex-oauth): default FAST mode to off to avoid surprise quota burn

service_tier="priority" consumes ChatGPT subscription quota at a higher
rate. Users must now opt in explicitly rather than inherit FAST mode
silently when this feature ships.

---------

Co-authored-by: Jason <farion1231@gmail.com>

src/i18n/locales/en.json

@@ -929,7 +929,9 @@
     "addAnotherAccount": "Add another account",
     "logoutAll": "Logout all accounts",
     "retry": "Retry",
-    "copyCode": "Copy code"
+    "copyCode": "Copy code",
+    "fastMode": "FAST mode",
+    "fastModeDescription": "Send service_tier=\"priority\" for lower latency. Off by default — enabling it consumes your ChatGPT quota at a higher rate."
   },
   "endpointTest": {
     "title": "API Endpoint Management",

src/i18n/locales/ja.json

@@ -929,7 +929,9 @@
     "addAnotherAccount": "別のアカウントを追加",
     "logoutAll": "すべてのアカウントをログアウト",
     "retry": "再試行",
-    "copyCode": "コードをコピー"
+    "copyCode": "コードをコピー",
+    "fastMode": "FAST モード",
+    "fastModeDescription": "低遅延のため service_tier=\"priority\" を送信します。既定ではオフ——オンにすると ChatGPT のクォータがより速く消費されます。"
   },
   "endpointTest": {
     "title": "API エンドポイント管理",

src/i18n/locales/zh.json

@@ -929,7 +929,9 @@
     "addAnotherAccount": "添加其他账号",
     "logoutAll": "注销所有账号",
     "retry": "重试",
-    "copyCode": "复制代码"
+    "copyCode": "复制代码",
+    "fastMode": "FAST 模式",
+    "fastModeDescription": "发送 service_tier=\"priority\" 换取更低延迟。默认关闭——开启后会按更高速率消耗 ChatGPT 配额。"
   },
   "endpointTest": {
     "title": "请求地址管理",