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.

README.md

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+# dotfiles
+
+Personal and server dotfiles. Kept in two areas:
+
+- `server/` — configs pulled from the homelab servers (iris, vega, nebula, nexus)
+- (personal dotfiles live at the repo root, kept separate from `server/`)
+
+## Layout
+
+```
+server/<host>/
+  .zshrc                      zsh config (oh-my-zsh, agnoster theme)
+  .vimrc                      vim config (dracula + lightline + Vundle)
+  .bashrc                     bash config (where present)
+  .config/htop/htoprc         htop config
+  .config/neofetch/config.conf neofetch config (where present)
+```
+
+## What is NOT included (and why)
+
+These are intentionally excluded from the repo:
+
+- `.ssh/`, `.kube/`, `.docker/`, `.ansible/` — secrets / infra credentials
+- `.zsh_history`, `.viminfo`, `.zcompdump*`, `.netrwhist` — ephemeral caches
+- `.oh-my-zsh/` — upstream framework (25–32M); reinstall instead of vendoring
+- `.vim/bundle/*` — Vundle-managed third-party plugins
+- `backup.sh`, `clean.sh`, `crontab.bak*`, `talosctl`, `places` — local utility
+  scripts / binaries specific to each host
+
+## Reinstalling the frameworks on a fresh server
+
+```sh
+# oh-my-zsh (theme used: agnoster)
+sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"
+
+# zsh-autosuggestions plugin
+git clone https://github.com/zsh-users/zsh-autosuggestions \
+  ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions
+
+# vim plugins (dracula, lightline, vim-gitbranch) via Vundle
+git clone https://github.com/VundleVim/Vundle.vim.git ~/.vim/bundle/Vundle.vim
+vim +PluginInstall +qall
+```
+
+After cloning `server/<host>/` contents into `/root`, source `.zshrc` (or
+re-login) and run `:PluginInstall` once in vim.