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).

breadhelp/content/getting-started/02-essential-keybinds/content.md

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+# The essential keybinds
+
+Hyprland is keyboard-first. You don't need a mouse for any of this — but
+nothing here is mandatory either, click around if you'd rather.
+
+## Windows
+
+- [Show Keybind]super + return[/Show Keybind] opens a terminal
+- [Show Keybind]super + backspace[/Show Keybind] closes the focused window
+- [Show Keybind]super + f[/Show Keybind] toggles fullscreen
+- [Show Keybind]super + i[/Show Keybind] toggles floating
+
+## Apps
+
+- [Show Keybind]super + space[/Show Keybind] opens the launcher (breadbox)
+- [Show Keybind]super + e[/Show Keybind] opens files
+- [Show Keybind]super + b[/Show Keybind] opens the browser
+- [Show Keybind]super + u[/Show Keybind] opens notes
+
+## The full list
+
+The Home tab's keybind viewer always has the complete, current list — this
+guide only covers the ones you'll use every day.

breadhelp/content/getting-started/02-essential-keybinds/meta.toml

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+title = "The essential keybinds"
+difficulty = "beginner"
+tags = ["keybinds", "hyprland"]
+related = ["01-what-is-bos"]
+estimated_minutes = 3