add:添加提供商proxy的i18n

Author: Li-shi-ling

dashboard/src/i18n/locales/en-US/features/config-metadata.json

@@ -1130,6 +1130,10 @@
         "description": "Service subscription key",
         "hint": "Azure TTS subscription key (not a token)."
       },
+      "proxy": {
+        "description": "Proxy Address",
+        "hint": "HTTP/HTTPS proxy address, format: http://127.0.0.1:7890. Only takes effect for API requests to this provider and does not affect Docker internal network communication."
+      },
       "dashscope_tts_voice": {
         "description": "Voice"
       },

dashboard/src/i18n/locales/zh-CN/features/config-metadata.json

@@ -1133,6 +1133,10 @@
         "description": "服务订阅密钥",
         "hint": "Azure_TTS 服务的订阅密钥（注意不是令牌）"
       },
+      "proxy": {
+        "description": "代理地址",
+        "hint": "HTTP/HTTPS 代理地址，格式如 http://127.0.0.1:7890。仅对该提供商的 API 请求生效，不影响 Docker 内网通信。"
+      },
       "dashscope_tts_voice": {
         "description": "音色"
       },