[ZSH] Add .zprofile for brew in login shells, fix mac_config link

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

zsh/.zprofile

@@ -0,0 +1,7 @@
+# Login shells that skip .zshrc (e.g. `su - user -c cmd`) still need brew on PATH.
+# Interactive shells rebuild PATH order later in .zshrc.
+if [[ -x /opt/homebrew/bin/brew ]]; then
+    eval "$(/opt/homebrew/bin/brew shellenv)"
+elif [[ -x /usr/local/bin/brew ]]; then
+    eval "$(/usr/local/bin/brew shellenv)"
+fi