feat: CLI MULTI/EXEC transaction support

- CliView: detect MULTI/EXEC/DISCARD commands
- MULTI enters transaction mode (tx> prompt, yellow)
- Commands in tx mode are queued (QUEUED + queue count)
- EXEC executes all queued commands, shows array results
- DISCARD cancels transaction
- WATCH/UNWATCH handled as non-queued tx commands
- i18n keys for tx messages (zh-CN + en)

ROADMAP.md

@@ -21,7 +21,7 @@
 - [x] **Monaco 编辑器** — 替换 StringEditor 的 textarea，支持 JSON 折叠/展开/语法高亮
 - [x] **Redis 命令自动补全** — CLI 输入时智能提示（基于 commands.js 命令数据库）
 - [x] **CLI SUBSCRIBE/MONITOR** — 实时消息流 + MONITOR 命令流 + 停止按钮
-- [ ] **CLI MULTI/EXEC** — 事务模式支持
+- [x] **CLI MULTI/EXEC** — 事务模式支持
 - [ ] **Stream 消费者组** — XINFO GROUPS / XINFO CONSUMERS 展开表格
 
 ## P2 — 重要功能增强