refactor: 把 hello 改成 welcome

src/lib/core/pouch/PouchCLI.js

@@ -26,7 +26,7 @@ class PouchCLI {
     // 批量注册所有命令
     this.registry.registerBatch({
       init: commands.InitCommand,
-      hello: commands.HelloCommand,
+      welcome: commands.WelcomeCommand,
       action: commands.ActionCommand,
       learn: commands.LearnCommand,
       recall: commands.RecallCommand,
@@ -115,7 +115,7 @@ class PouchCLI {
 
 💡 使用示例:
         ${COMMANDS.INIT}              # 初始化工作环境
-        ${COMMANDS.HELLO}             # 发现可用角色
+        ${COMMANDS.WELCOME}           # 发现可用角色
         ${COMMANDS.ACTION} copywriter # 激活文案专家
         ${COMMANDS.LEARN} scrum       # 学习敏捷知识
         ${COMMANDS.RECALL} frontend   # 检索前端记忆