feat: 添加自定义提示文档，说明如何创建和管理可重用的提示

Author: catlog22

.claude/commands/issue/new.md

@@ -413,5 +413,4 @@ function parseMarkdownBody(body) {
 
 ## Related Commands
 
-- `/issue:plan` - Plan solution for issue
-
+- `/issue:plan` - Plan solution for issue