refactor(shell): stop managing ~/.zprofile

Always-on and machine hooks already live in .zshenv / local.zsh.
Drop the empty stub, remove it on deploy, and leave real .zprofile
files to optional migration into local.zsh only.

.zprofile

@@ -1,3 +0,0 @@
-# Login shell hook. easyzsh keeps PATH and machine-local env in ~/.zshenv
-# (via ~/.config/zsh/local.zsh). Leave this file empty unless a tool insists
-# on writing login-only hooks here — prefer moving those into local.zsh.