refactor(home): move personal data out of the shared home modules

The dockerpi ssh host shortcut (home/shell.nix) and the gammastep
night-light coordinates (home/sway.nix) were hardcoded in shared modules,
so every host inherited them. Move both into a per-user module
(users/lyrathorpe/home.nix) imported on Lyra's hosts only, not the work
box; the gammastep block is Linux-guarded so Darwin skips it.

No build change on existing hosts: the generated configs are byte-identical
(verified by drvPath), the data is simply no longer in shared modules.

flake.nix

@@ -224,6 +224,7 @@
             ];
             users.lyrathorpe.homeModules = [
               ./home
+              ./users/lyrathorpe/home.nix
               ./home/desktop.nix
             ];
           };
@@ -245,6 +246,7 @@
             ];
             users.lyrathorpe.homeModules = [
               ./home
+              ./users/lyrathorpe/home.nix
               ./home/desktop.nix
             ];
           };
@@ -262,6 +264,7 @@
             ];
             users.lyrathorpe.homeModules = [
               ./home
+              ./users/lyrathorpe/home.nix
               ./home/desktop.nix
             ];
           };
@@ -295,7 +298,10 @@
               inputs.nixos-hardware.nixosModules.raspberry-pi-5
               ./modules/ssh.nix
             ];
-            users.lyrathorpe.homeModules = [ ./home ];
+            users.lyrathorpe.homeModules = [
+              ./home
+              ./users/lyrathorpe/home.nix
+            ];
           };
         };
 
@@ -311,6 +317,7 @@
             ];
             homeModules = [
               ./home
+              ./users/lyrathorpe/home.nix
             ];
           };
         };