Add zsh-autosuggestions and zsh-syntax-highlighting to Linux package list

The dnf block in `run_install-packages.sh.tmpl` installs core CLI tools but is missing `zsh-autosuggestions` and `zsh-syntax-highlighting`. These were installed manually on echo-turbine during initial setup.

Add to the dnf section (~line 158):
```bash
$SUDO dnf install -y zsh-autosuggestions zsh-syntax-highlighting || true
```

These are already sourced in `env.zsh` with OS-conditional paths.