feat: CLI SUBSCRIBE/MONITOR streaming mode

- New pubsub.ts: startSubscribe/stopSubscribe/startMonitor/stopMonitor
- IPC: redis:subscribe, redis:unsubscribe, redis:monitor, redis:monitorStop
- Streaming messages pushed via webContents.send
- Preload: onSubscribeMessage/onMonitorMessage callbacks
- CliView: detect SUBSCRIBE/PSUBSCRIBE/MONITOR, switch to streaming mode
- Stop button with pulsing indicator (green=subscribe, yellow=monitor)
- Real-time message display with timestamps
- Auto-cleanup on unmount
- i18n keys (zh-CN + en)

src/i18n/locales/zh-CN.ts

@@ -137,6 +137,11 @@ export default {
     title: 'CLI',
     welcome: 'Redis CLI - 在下方输入命令',
     placeholder: '输入 Redis 命令...',
+    stopSubscribe: '停止订阅',
+    stopMonitor: '停止监控',
+    subscribed: '已订阅，等待消息...',
+    monitoring: '监控中，等待命令...',
+    subscribedTo: '已订阅频道: {channels}',
   },
   slowlog: {
     title: '慢日志',