feat: Command Log dialog

- New commandLogger.ts: in-memory log (max 5000 entries)
- withLog() wrapper in ipc-handlers.ts for all write commands
- CommandLog.vue: table with time/command/duration, write-only filter
- IPC: redis:getCommandLog, redis:clearCommandLog
- Ctrl+G shortcut from Sidebar
- i18n keys (zh-CN + en)

electron/preload/index.d.ts

@@ -102,6 +102,8 @@ export interface ElectronAPI {
     existsKey: (id: string, key: string) => Promise<boolean>
     ping: (id: string) => Promise<string>
     isConnected: (id: string) => Promise<boolean>
+    getCommandLog: () => Promise<any[]>
+    clearCommandLog: () => Promise<void>
   }
 }