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/programs/zen/default.nix.old

@@ -1,62 +0,0 @@
-{
-  pkgs,
-  lib,
-  config,
-  ...
-}:
-{
-  programs.zen-browser = {
-    enable = true;
-
-    policies = {
-      DisableTelemetry = true;
-      DisableFirefoxStudies = true;
-      DisablePocket = true;
-
-      OfferToSaveLogins = false;
-      PasswordManagerEnabled = false;
-
-      AutofillAddressEnabled = false;
-      AutofillCreditCardEnabled = false;
-
-      DontCheckDefaultBrowser = true;
-
-      DNSOverHTTPS = {
-        Enabled = true;
-        ProviderURL = "https://dns.quad9.net/dns-query";
-        Locked = true;
-      };
-    };
-
-    profiles.default = {
-      search = {
-        force = true;
-        default = "Startpage";
-      };
-
-      settings = {
-        "browser.startup.homepage" = "https://duckduckgo.com";
-
-        "browser.newtabpage.enabled" = false;
-
-        "privacy.resistFingerprinting" = true;
-        "privacy.trackingprotection.enabled" = true;
-
-        "geo.enabled" = false;
-        "dom.webnotifications.enabled" = false;
-
-        "signon.rememberSignons" = false;
-
-        "toolkit.telemetry.enabled" = false;
-      };
-
-      extensions.packages = with pkgs.nur.repos.rycee.firefox-addons; [
-        ublock-origin
-        firefox-multi-account-containers
-        noscript
-      ];
-    };
-  };
-
-  home.sessionVariables.BROWSER = "zen";
-}

home/programs/zen/system.nix.old

@@ -1,24 +0,0 @@
-{
-  programs.zen-browser = {
-    enable = true;
-
-    policies = {
-      DisableTelemetry = true;
-      DisableFirefoxStudies = true;
-
-      OfferToSaveLogins = false;
-      PasswordManagerEnabled = false;
-
-      DNSOverHTTPS = {
-        Enabled = true;
-        ProviderURL = "https://dns.quad9.net/dns-query";
-        Locked = true;
-      };
-
-      Homepage = {
-        URL = "https://duckduckgo.com";
-        StartPage = "homepage";
-      };
-    };
-  };
-}