Feature: Enable hypridle without locking during Sunshine streams

Sunshine's global_prep_cmd now runs hypr/scripts/SunshineIdle.sh, which
holds a systemd idle inhibitor for the length of a stream (hypridle
respects it) and unlocks hyprlock if the session was already locked.
With that in place hypridle starts at login again.

Sunshine's config (sunshine.conf, apps.json, prep scripts) moves into
the dotfiles; credentials, logs and state stay local and are gitignored.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

bootstrap.sh

@@ -152,6 +152,8 @@ step "Linking dotfiles with stow"
 # Create real parent dirs first, otherwise stow symlinks the whole directory
 # (e.g. ~/.config) into the repo and every app's files end up in git
 mkdir -p "$HOME/.config" "$HOME/.local/bin" "$HOME/.local/share" "$HOME/Pictures"
+# Sunshine keeps credentials and logs beside its config; those must stay out of git
+mkdir -p "$HOME/.config/sunshine"
 mkdir -p -m 700 "$HOME/.ssh"
 if ! stow -d "$repo" -t "$HOME" --restow dotfiles; then
     echo "stow hit conflicts (listed above). Move those files aside, then run:" >&2