feat(auth): load model lists via /model-definitions/{channel} instead of per-file

model sources.

src/i18n/locales/en.json

@@ -512,7 +512,7 @@
     "upgrade_required_title": "Please upgrade CLI Proxy API",
     "upgrade_required_desc": "The current server does not support the OAuth excluded models API. Please upgrade to the latest CLI Proxy API (CPA) version."
   },
-  "oauth_model_mappings": {
+  "oauth_model_alias": {
     "title": "OAuth Model Aliases",
     "add": "Add Alias",
     "add_title": "Add provider model aliases",

src/i18n/locales/zh-CN.json

@@ -512,7 +512,7 @@
     "upgrade_required_title": "需要升级 CPA 版本",
     "upgrade_required_desc": "当前服务器版本不支持获取模型排除列表功能，请升级到最新版本的 CPA（CLI Proxy API）后重试。"
   },
-  "oauth_model_mappings": {
+  "oauth_model_alias": {
     "title": "OAuth 模型别名",
     "add": "新增别名",
     "add_title": "新增提供商模型别名",