Add server dotfiles (iris, vega, nebula, nexus)

Pulled zsh/vim/bash/htop/neofetch configs into server/<host>/.
Excluded secrets (.ssh/.kube/.docker/.ansible), shell/editor caches,
and vendored upstream frameworks (oh-my-zsh, Vundle plugins) per dotfiles
best practice; reinstall steps documented in README.md.

.gitignore

@@ -0,0 +1,28 @@
+# Never commit secrets, caches, or heavy upstream frameworks.
+# (server/*/* are curated configs, but this guards against accidental adds.)
+
+# Secrets & infra creds
+.ssh/
+.kube/
+.docker/
+.ansible/
+
+# Shell / editor ephemeral
+.zsh_history
+.viminfo
+.zcompdump*
+.netrwhist
+.selected_editor
+.lesshst
+.wget-hsts
+
+# Upstream frameworks (reinstall, don't vendor)
+.oh-my-zsh/
+.vim/bundle/
+
+# Local server utility scripts & misc
+backup.sh
+clean.sh
+crontab.bak.*
+talosctl*
+places