feat: 增加登录页面的桌面和移动端支持，优化语言切换器和表单组件

src/i18n/locales/zh/common.json

@@ -2,7 +2,7 @@
   "language": {
     "en": "English",
     "ne": "नेपाली",
-    "zh": "中文"
+    "zh": "简体中文"
   },
   "languageShort": {
     "en": "EN",

src/i18n/locales/zh/entry.json

@@ -53,7 +53,11 @@
     "title": "代理玩家登录",
     "hint": "使用代理为您开通的账号登录。主站用户请从主站进入。",
     "username": "登录账号",
+    "usernamePlaceholder": "请输入登录账号",
     "password": "密码",
+    "passwordPlaceholder": "请输入密码",
+    "showPassword": "显示密码",
+    "hidePassword": "隐藏密码",
     "submit": "登录",
     "missingFields": "请填写账号和密码",
     "failed": "登录失败",