fix(config): support Redis ACL username

frontend/src/i18n/locales/en/landing.ts

@@ -215,8 +215,10 @@ export default {
       description: 'Connect to your Redis server',
       host: 'Host',
       port: 'Port',
+      username: 'Username (optional)',
       password: 'Password (optional)',
       database: 'Database',
+      usernamePlaceholder: 'Leave empty for default user',
       passwordPlaceholder: 'Password',
       enableTls: 'Enable TLS',
       enableTlsHint: 'Use TLS when connecting to Redis (public CA certs)'

frontend/src/i18n/locales/zh/landing.ts

@@ -215,8 +215,10 @@ export default {
       description: '连接到您的 Redis 服务器',
       host: '主机',
       port: '端口',
+      username: '用户名（可选）',
       password: '密码（可选）',
       database: '数据库',
+      usernamePlaceholder: '默认用户留空',
       passwordPlaceholder: '密码',
       enableTls: '启用 TLS',
       enableTlsHint: '连接 Redis 时使用 TLS（公共 CA 证书）'