drop the login footer note

Remove the deployment blurb and the token-storage hint from the sign-in
page. They described implementation details rather than helping anyone
sign in, and the token line exposed the storage mechanism to anyone
looking at the screen. Also removes the now-unused .login-legal rule and
the two locale keys behind it.

packages/client/src/i18n/locales/en.ts

@@ -24,8 +24,6 @@ export default {
     showPassword: 'Show password',
     hidePassword: 'Hide password',
     fillDefaults: 'Sign in with the default account',
-    localDeploymentNote: 'Self-hosted · no telemetry · data never leaves this machine',
-    tokenHint: 'The token returned by POST /api/auth/login is stored in localStorage',
     accessDenied: 'You do not have permission to access this resource.',
     passwordMismatch: 'Passwords do not match',
     passwordTooShort: 'Password must be at least 6 characters',

packages/client/src/i18n/locales/zh.ts

@@ -24,8 +24,6 @@ export default {
     showPassword: '显示密码',
     hidePassword: '隐藏密码',
     fillDefaults: '使用默认账号登录',
-    localDeploymentNote: '本地部署 · 无遥测 · 数据不出机器',
-    tokenHint: '登录后 POST /api/auth/login 返回的 token 存入 localStorage',
     accessDenied: '你没有权限访问该资源',
     passwordMismatch: '两次密码不一致',
     passwordTooShort: '密码长度至少 6 个字符',