Add server CLI tools installer for Ubuntu/Debian servers

Introduce a self-contained repo with an interactive install.sh that
provisions zsh, oh-my-zsh, aliases, bat/yazi configs, docker shortcuts,
and git-delta pager setup. Configs are adapted from dotfiles for SSH-only
servers — no desktop or neovim dependencies.

Installer supports --all, --update (git pull + re-run), and --uninstall
with backup restore. Core packages include vim (default editor), yazi via
apt, and idempotent apt installs with warnings for eza and git-delta when
repos lack them.

configs/aliases/.git_bash_autocomplete

@@ -0,0 +1,11 @@
+gco() {
+  git checkout "$@"
+}
+# Enable git completion if available
+if [ -f /usr/share/bash-completion/completions/git ]; then
+  . /usr/share/bash-completion/completions/git
+fi
+# Enable git branch completion for gc
+if type __git_complete &>/dev/null; then
+  __git_complete gco _git_checkout
+fi