feat: add workspace list command

src/channels/qq/qq-bridge.mjs

@@ -7,6 +7,7 @@ const HELP_TEXT = [
   '直接发送文字即可继续当前会话。',
   '/new  开启一个全新会话',
   '/workspace 工作区绝对路径  切换工作区',
+  '/workspacelist  列出工作区绝对路径',
   '/status  检查连接状态',
   '/help  显示本帮助',
 ].join('\n');
@@ -127,7 +128,9 @@ export class QqHarnessBridge {
       }
       const workspaceCommand = await runWorkspaceCommand(text, this.#harness);
       if (workspaceCommand) {
-        await this.#bot.sendText(target, workspaceCommand.message);
+        for (const reply of workspaceCommand.messages ?? [workspaceCommand.message]) {
+          await this.#bot.sendText(target, reply);
+        }
         await this.#state.markSeen(messageId);
         return;
       }