Migrate Hyprland to Lua config, drop dead flake inputs, general cleanup

Hyprland
- Switch wayland.windowManager.hyprland to configType = "lua" (Hyprland 0.56)
- Convert settings, env, monitors, window rules, gesture, animations
  (hl.curve/hl.animation) and all keybinds to hl.* calls
- Add home/system/hyprland/lib.nix with exec/bind/execOnce helpers;
  every exec-once now runs from a hyprland.start hook
- Drop hard-coded default_monitor = "eDP-2"

Flake
- Remove blog, awesome-wallpapers and default-creds inputs (their repos
  no longer ship a flake.nix and broke `nix flake update`), along with
  the server modules and Glance links that used them
- Update flake.lock
- Replace removed `gcr` with `gcr_4`

Fixes
- Point configDirectory at /etc/nixos/nixy on home-pc and thinkpad
- Fix home-pc git email typo
- Remove conflicting openpgp signing format, make pull.rebase a boolean,
  replace hx/peco in git aliases with nvim/sk
- Fix zsh NUL alias (2>&1) and stop forcing bat colors in the cat alias
- Require a password for sudo again (nixos-rebuild stays NOPASSWD)
- Remove duplicate hardware.graphics block from home-pc flake
- Delete unused zen .old files, run alejandra on host files

home/system/waybar/default.nix

@@ -7,6 +7,7 @@ let
   terminal = cmd: "uwsm app -- ${lib.getExe pkgs.ghostty} -e ${cmd}";
 
   radius = toString config.theme.bar-rounding;
+  hl = import ../hyprland/lib.nix {inherit lib;};
 in
 {
   home.packages = with pkgs; [
@@ -269,9 +270,5 @@ in
     }
   '';
 
-  wayland.windowManager.hyprland.settings = {
-    exec-once = [
-      "waybar"
-    ];
-  };
+  wayland.windowManager.hyprland.settings.on = hl.execOnce ["waybar"];
 }