feat(admin): 登录表单按验收反馈精简——去标签/去底部文案/滑块与输入框等高

Co-Authored-By: Claude Code <noreply@anthropic.com>

admin/src/locales/langs/en.json

@@ -172,9 +172,6 @@
     "rememberPwd": "Stay signed in",
     "forgetPwd": "Forgot password",
     "btnText": "Login",
-    "accountLabel": "Account",
-    "passwordLabel": "Password",
-    "adminAssigned": "Accounts are assigned by the administrator",
     "success": {
       "title": "Login successful",
       "message": "Welcome back"

admin/src/locales/langs/zh.json

@@ -172,9 +172,6 @@
     "rememberPwd": "保持登录",
     "forgetPwd": "忘记密码",
     "btnText": "登录",
-    "accountLabel": "账号",
-    "passwordLabel": "密码",
-    "adminAssigned": "账号由管理员分配",
     "success": {
       "title": "登录成功",
       "message": "欢迎回来"