Extract bos-settings to its own repo; add breadhelp; JSON-driven Hyprland config

bos-settings moves to git.breadway.dev/Breadway/bos-settings (full history
preserved via git-filter-repo) so its release cadence is decoupled from
BOS's own. breadhelp takes its place as this repo's workspace member: a
GTK4 onboarding/help center replacing the old bos-welcome/bos-keybinds
bash scripts with searchable guides, an interactive keybind viewer
(sourced from the new keybinds.toml, not parsed out of hyprland.lua or
hardcoded), a troubleshooting wizard with one-click fixes, and a proper
first-run tour. bos-netcheck extracts bos-welcome's network-check half,
which still needs to run every login independent of breadhelp's own
first-run gating.

hyprland.lua's keybinds/settings/monitors/autostart are now JSON-driven
(binds.json/settings.json/monitors.json/autostart.json) with every
loader pcall-wrapped and falling back to hardcoded defaults per field on
bad or missing config, so bread* apps (bos-settings' new editors, and
breadhelp's keybind viewer) can read/write this config without ever
being able to leave the compositor unable to start.

CI's package.yml now builds breadhelp instead of bos-settings on tag
push; bos-settings needs its own equivalent workflow in its new repo
(not yet set up).

iso/packages.x86_64

@@ -187,9 +187,10 @@ yay-bin
 # networkmanager, openssl, zlib, systemd-libs) — keep those even though no bread
 # package depends on them.
 #
-# bos-settings is a BOS-specific pacman package (not part of the bakery index),
-# so it stays here, served from the [breadway] repo.
+# bos-settings and breadhelp are BOS-specific pacman packages (not part of the
+# bakery index), so they stay here, served from the [breadway] repo.
 bos-settings
+breadhelp
 
 # Input / screen utilities
 brightnessctl