Add 3x-ui user sync via panel API (login or Bearer token).

Co-authored-by: Cursor <cursoragent@cursor.com>

translations/zh.json

@@ -210,6 +210,14 @@
   "api_key_label": "API 密钥",
   "enable_sync": "开启同步",
   "sync_hint": "将根据 Remnawave 数据自动创建、禁用和删除用户",
+  "xui_url_label": "3x-ui 地址",
+  "xui_url_hint": "包含协议、端口和 webBasePath（如有）",
+  "xui_api_token_label": "API Token（推荐）",
+  "xui_api_token_placeholder": "Settings → Security → API Token",
+  "xui_api_token_hint": "若已设置，将跳过用户名/密码登录",
+  "xui_username_label": "3x-ui 用户名",
+  "xui_password_label": "3x-ui 密码",
+  "xui_sync_hint": "3x-ui 客户端将按 email 同步为面板用户",
   "sync_now_btn": "🔄 立即同步",
   "delete_sync_btn": "🗑 删除同步数据",
   "auto_create_conns": "自动创建连接",