feat(hyprland): add per-monitor workspace homing and monitor nav binds

New `local.hyprland.workspaceRules` option binds workspaces to monitor
connectors so each has a home screen; a consumer sets it from its own host
config (empty by default). Soft binding — an absent monitor's workspaces fall
back to an active one, so a laptop-only session still works.

`$mod+o` / `$mod SHIFT+o` focus and move the current workspace to the other
monitor. When rules are set, an `exec-once` nudges a single-monitor session to
workspace 1 rather than a support monitor's high default.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

hosts/example/home.nix

@@ -14,4 +14,17 @@
     name = "Example User";
     email = "user@example.com";
   };
+
+  # Optional: give workspaces a home monitor (see modules/hyprland-workspaces.nix).
+  # Bind by connector name (`hyprctl monitors`), not panel identity, so any
+  # monitor on that port inherits the rules. `default:true` sets what a screen
+  # shows on connect. Absent monitors fall back, so a single-screen session still
+  # works. Left unset here — uncomment and adjust to your outputs.
+  #
+  # local.hyprland.workspaceRules = [
+  #   "1, monitor:HDMI-A-1, default:true"   # external, workspaces 1-5
+  #   "2, monitor:HDMI-A-1"
+  #   "6, monitor:LVDS-1, default:true"     # laptop, workspaces 6-9
+  #   "7, monitor:LVDS-1"
+  # ];
 }