Scaffold BOS repo: dotfiles, ISO profile, and bos-settings GTK4 app

Implements all four components from the BOS spec:
- dotfiles/: default Hyprland, bread, breadbox, breadcrumbs configs
- iso/: archiso profiledef, package list, Calamares YAML modules, post-install.sh
- bos-settings/: Cargo workspace with GTK4 settings app (8 views: snapshots,
  packages, bread, breadbar, breadbox, breadcrumbs, breadpad, hyprland)

https://claude.ai/code/session_01WszGHvCmxgcyTwNSkfLF9P

dotfiles/hyprland/hyprland.conf

@@ -0,0 +1,54 @@
+monitor=,preferred,auto,1
+
+exec-once = breadd
+exec-once = breadbar
+exec-once = breadbox-sync
+
+source = ~/.config/hypr/keybinds.conf
+
+general {
+    gaps_in = 5
+    gaps_out = 10
+    border_size = 2
+    col.active_border = rgba(88c0d0ff)
+    col.inactive_border = rgba(4c566aff)
+    layout = dwindle
+}
+
+decoration {
+    rounding = 8
+    blur {
+        enabled = true
+        size = 6
+        passes = 2
+    }
+    drop_shadow = true
+    shadow_range = 12
+    shadow_render_power = 3
+}
+
+animations {
+    enabled = true
+    bezier = ease, 0.25, 0.1, 0.25, 1.0
+    animation = windows, 1, 4, ease
+    animation = fade, 1, 4, ease
+    animation = workspaces, 1, 5, ease
+}
+
+input {
+    kb_layout = us
+    follow_mouse = 1
+    touchpad {
+        natural_scroll = true
+    }
+}
+
+dwindle {
+    pseudotile = true
+    preserve_split = true
+}
+
+misc {
+    disable_hyprland_logo = true
+    disable_splash_rendering = true
+}