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/airootfs/etc/skel/.config/hypr/settings.json

@@ -0,0 +1,19 @@
+{
+  "gaps_in": 5,
+  "gaps_out": 10,
+  "border_size": 2,
+  "active_border": "rgba(88c0d0ff)",
+  "inactive_border": "rgba(4c566aff)",
+  "layout": "dwindle",
+  "resize_on_border": true,
+  "rounding": 8,
+  "blur_enabled": true,
+  "blur_size": 6,
+  "blur_passes": 2,
+  "shadow_enabled": true,
+  "shadow_range": 12,
+  "shadow_render_power": 3,
+  "kb_layout": "us",
+  "follow_mouse": 1,
+  "natural_scroll": true
+}