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.

home/shell.nix

@@ -341,9 +341,6 @@ in
         IdentityFile = "~/.ssh/code.emmathe.dev";
         IdentitiesOnly = true;
       };
-      "dockerpi.inf.cbg.emmaisvery.gay" = {
-        User = "emmathorpe";
-      };
     };
   };