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/configuration.nix

@@ -1,8 +1,8 @@
 {config, ...}: {
   imports = [
     # ─────────────────────────────────────────────────────────────
-		# System configuration
-		# ─────────────────────────────────────────────────────────────
+    # System configuration
+    # ─────────────────────────────────────────────────────────────
     ../../nixos/audio.nix
     ../../nixos/docker.nix
     ../../nixos/bluetooth.nix
@@ -16,15 +16,15 @@
     ../../nixos/utils.nix
     ../../nixos/hyprland.nix
 
-		# ─────────────────────────────────────────────────────────────
-		# Graphics Card
-		# ─────────────────────────────────────────────────────────────
-		../../nixos/amd-graphics.nix
+    # ─────────────────────────────────────────────────────────────
+    # Graphics Card
+    # ─────────────────────────────────────────────────────────────
+    ../../nixos/amd-graphics.nix
 
-		# ─────────────────────────────────────────────────────────────
-		# System integration for Steam
-		# ─────────────────────────────────────────────────────────────
-		../../nixos/steam.nix
+    # ─────────────────────────────────────────────────────────────
+    # System integration for Steam
+    # ─────────────────────────────────────────────────────────────
+    ../../nixos/steam.nix
 
     # You should let those lines as is
     ./hardware-configuration.nix
@@ -33,7 +33,7 @@
 
   programs.nix-ld.enable = true; #Dynamic Linking
   home-manager.users."${config.var.username}" = import ./home.nix;
-	services.flatpak.enable = true;
+  services.flatpak.enable = true;
   # Don't touch this
   system.stateVersion = "24.05";
 }