Build the shell configuration into the resources

The shell configuration was copied from the server by hand. It now has
its own directory, which make_files.py copies into the resources, so
that the resources are the whole set of files the cleanup restores and
nothing has to be copied by hand.

Co-Authored-By: Claude Code <noreply@anthropic.com>

server/shell/.zshenv

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+# Preset what MSYS2's /etc/profile would otherwise start a helper process for (~90 ms each here).
+# TZ has to match the Windows timezone (W. Europe Standard Time).
+export LANG=en_US.UTF-8 TZ=Europe/Berlin

server/shell/.zshrc

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+# History shared between sessions.
+HISTFILE=~/.zsh_history HISTSIZE=10000 SAVEHIST=10000
+setopt share_history hist_ignore_dups hist_ignore_space interactive_comments auto_cd
+
+# Completion: menu, case-insensitive, colored. -C skips compaudit, which is slow on
+# Windows and meaningless under MSYS2's noacl mounts (rm ~/.zcompdump after adding completions).
+autoload -Uz compinit && compinit -C
+zstyle ':completion:*' menu select
+zstyle ':completion:*' matcher-list 'm:{a-z}={A-Z}'
+zstyle ':completion:*' list-colors ${(s.:.)LS_COLORS}
+
+# Emacs keys; Up/Down search history for what is already typed.
+bindkey -e
+autoload -Uz up-line-or-beginning-search down-line-or-beginning-search
+zle -N up-line-or-beginning-search && zle -N down-line-or-beginning-search
+bindkey '^[[A' up-line-or-beginning-search '^[OA' up-line-or-beginning-search
+bindkey '^[[B' down-line-or-beginning-search '^[OB' down-line-or-beginning-search
+
+# Prompt: user@host:directory, git branch, exit status of the last command if it failed.
+# A literal '#' as on Linux: zsh's %# would show '%', since this root is not uid 0.
+# The branch is read from .git/HEAD directly: starting git on every prompt is slow on Windows.
+precmd() {
+  local d=$PWD head=
+  until [[ -e $d/.git || $d == / ]]; do d=${d:h}; done
+  [[ -f $d/.git/HEAD ]] && read -r head < $d/.git/HEAD
+  [[ $head == 'ref: '* ]] && git_branch=${head#ref: refs/heads/} || git_branch=${head:0:7}
+  print -Pn '\e]0;%n@%m: %~\a'
+}
+setopt prompt_subst
+PROMPT='%F{green}%n@%m%f:%F{blue}%~%f${git_branch:+ %5F($git_branch)%f}%(?.. %F{red}[%?]%f)# '
+
+alias ls='ls --color=auto' ll='ls -lah' grep='grep --color=auto'
+
+# Process monitor: htop does not exist for MSYS2 (its /proc only shows MSYS2 processes).
+# bottom is a native Windows program; winpty lets it draw in the pty, as Server 2016 has no ConPTY.
+alias btm='winpty /ucrt64/bin/btm'