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

hosts/home-pc/variables.nix

@@ -11,7 +11,7 @@
   config.var = {
     hostname = "home-pc";
     username = "andi";
-    configDirectory = "/home/" + config.var.username + "/.config/nixos"; # The path of the nixos configuration directory
+    configDirectory = "/etc/nixos/nixy"; # The path of the nixos configuration directory
 
     keyboardLayout = "de";
 
@@ -21,7 +21,7 @@
 
     git = {
       username = "kptltd00m";
-      email = "kptltd00m.doomlabs.de";
+      email = "kptltd00m@doomlabs.de";
     };
 
     autoUpgrade = false;