feat: Sentinel mode support

- NewConnectionDialog: sentinel toggle + host/port/masterName/nodePassword form
- connection.ts: use ioredis sentinels config when sentinelEnabled
- Add sentinelEnabled/sentinelHost/sentinelPort/sentinelNodePassword to all types
- i18n keys for all sentinel fields (zh-CN + en)

src/i18n/locales/zh-CN.ts

@@ -34,6 +34,11 @@ export default {
     tlsCertPath: '客户端证书',
     tlsKeyPath: '客户端私钥',
     tlsRejectUnauthorized: '验证服务器证书',
+    sentinel: 'Sentinel 哨兵模式',
+    sentinelHost: '哨兵主机',
+    sentinelPort: '哨兵端口',
+    sentinelMasterName: 'Master 名称',
+    sentinelNodePassword: '哨兵密码',
     ssh: 'SSH 隧道',
     sshHost: 'SSH 主机',
     sshPort: 'SSH 端口',