chore(shell): powerlevel10k prompt, host-aware bootstrap, drop thefuck

- zsh prompt: replace oh-my-posh with powerlevel10k via zinit, with the
  instant-prompt preamble near the top of .zshrc for fast startup
- remove thefuck/thefk entirely: .zshrc aliases, install-thefk,
  home_config/thefuck, and its .stow-global-ignore entry
- link-dotfiles: one-shot host-aware bootstrap — detect macOS vs Linux,
  install GNU stow if missing (brew / apt/dnf/pacman), then stow both trees
- retire oh-my-posh: delete the bash + pwsh installers and
  home_config/ohmyposh (starship covers PowerShell separately)
- README: document the new bootstrap and prompt setup

home_root/.zshrc

@@ -3,9 +3,12 @@ path=(~/bin $path)
 path=(~/.local/bin $path)
 path=(~/.cache/lk-tools/fzf/bin $path)
 
-
-# Init OhMyPosh
-eval "$(oh-my-posh init zsh --config https://333e8677ac54a1845fe68813017ab7e807c87ab2@gitea.phasefinal.com/vh/dotfiles/raw/branch/master/home_config/ohmyposh/lkraven.toml)" 
+# Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
+# Initialization code that may require console input (password prompts, [y/n]
+# confirmations, etc.) must go above this block; everything else may go below.
+if [[ -r "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh" ]]; then
+  source "${XDG_CACHE_HOME:-$HOME/.cache}/p10k-instant-prompt-${(%):-%n}.zsh"
+fi
 
 # Set ZINIT Home
 ZINIT_HOME="${HOME}/.config/zinit/zinit.git"
@@ -20,6 +23,10 @@ fi
 source "${ZINIT_HOME}/zinit.zsh"
 
 # add zinit
+# Powerlevel10k prompt theme (replaces oh-my-posh; instant prompt = fast startup)
+zinit ice depth=1
+zinit light romkatv/powerlevel10k
+
 zinit light zsh-users/zsh-syntax-highlighting
 zinit light zsh-users/zsh-completions
 zinit light zsh-users/zsh-autosuggestions
@@ -67,7 +74,7 @@ alias cat='bat'
 alias tree='eza --tree'
 
 # To customize prompt, run `p10k configure` or edit ~/.p10k.zsh.
-# [[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh
+[[ ! -f ~/.p10k.zsh ]] || source ~/.p10k.zsh
 [ -f ~/.fzf.zsh ] && source ~/.fzf.zsh
 
 export FZF_DEFAULT_COMMAND="fd --hidden --strip-cwd-prefix --exclude .git"
@@ -99,9 +106,6 @@ export BAT_THEME=Nord
 eval "$(zoxide init zsh)"
 alias cd='z'
 
-eval $(thefuck --alias)
-eval $(thefuck --alias fk)
-
 zinit light Aloxaf/fzf-tab