fix(install): add zprofile fallback and create zshrc on fresh macOS installs (#2320)

On macOS, zsh users may not have ~/.zshrc if they haven't customized
their shell yet. The installer would silently fail to add ~/.local/bin
to PATH, causing 'hermes: command not found' after installation.

- Check ~/.zprofile as fallback for zsh users (macOS login shell config)
- Create ~/.zshrc if neither config file exists

Cherry-picked from PR #2315 by erhnysr.

Co-authored-by: erhnysr <erhnysr@users.noreply.github.com>

scripts/install.sh

@@ -772,6 +772,12 @@ setup_path() {
         case "$LOGIN_SHELL" in
             zsh)
                 [ -f "$HOME/.zshrc" ] && SHELL_CONFIGS+=("$HOME/.zshrc")
+                [ -f "$HOME/.zprofile" ] && SHELL_CONFIGS+=("$HOME/.zprofile")
+                # If neither exists, create ~/.zshrc (common on fresh macOS installs)
+                if [ ${#SHELL_CONFIGS[@]} -eq 0 ]; then
+                    touch "$HOME/.zshrc"
+                    SHELL_CONFIGS+=("$HOME/.zshrc")
+                fi
                 ;;
             bash)
                 [ -f "$HOME/.bashrc" ] && SHELL_CONFIGS+=("$HOME/.bashrc")