Request support for autocompletion of the alias command in zsh

Request support for autocompletion of the alias command， like `.j`

like kubectl command：
```source
source <(kubectl completion zsh)
alias k=kubectl
compdef __start_kubectl k
```
Then you can use the autocompletion of the command k

Review the existing zsh completion behavior for just and compare it with the kubectl completion example in the issue. Determine how aliases such as `.j` or `k` should receive command completion, then verify that the documented alias cases work in zsh.

Written by the indexing model from the issue text.