Add new server modules and configurations for various services

- Introduced `default-creds` module for managing default credentials with Umami integration.
- Added `fail2ban` module for brute-force attack protection with configurable ban times.
- Created `firewall` module to enable and configure basic firewall settings.
- Implemented `gitea` module for self-hosted Git service with PostgreSQL backend.
- Developed `glance` module for a customizable dashboard with various widgets and themes.
- Added `iknowyou` module for a self-hosted password manager with production and demo environments.
- Introduced `kernel-hardening` module for enhancing kernel security settings.
- Created `mazanoke` module for a simple web application with Nginx integration.
- Added `mealie` module for a self-hosted meal planning application.
- Implemented `stirling-pdf` module for PDF generation service.
- Developed `umami` module for self-hosted analytics with secret management.
- Added `ssh` module for secure SSH configuration with user restrictions.
- Introduced `nixy` theme for a customized aesthetic experience across services.

nixos/tuigreet.nix

@@ -0,0 +1,62 @@
+{
+  pkgs,
+  inputs,
+  config,
+  lib,
+  ...
+}: let
+  c = config.lib.stylix.colors;
+  tuigreet = inputs.notashelf-tuigreet.packages.${pkgs.stdenv.hostPlatform.system}.default;
+
+  theme = lib.concatStringsSep ";" [
+    "border=#${c.base0D}"
+    "text=#${c.base05}"
+    "prompt=#${c.base0D}"
+    "action=#${c.base0C}"
+    "button=#${c.base0D}"
+    "container=#${c.base00}"
+    "input=#${c.base02}"
+  ];
+
+  tuigreet-launch = pkgs.writeShellScript "tuigreet-launch" ''
+    exec ${tuigreet}/bin/tuigreet \
+      --time \
+      --time-format '%H:%M  %A %d %B' \
+      --sessions /run/current-system/sw/share/wayland-sessions \
+      --remember \
+      --remember-user-session \
+      --asterisks \
+      --greeting 'Welcome' \
+      --container-padding 2 \
+      --theme '${theme}' \
+      --power-shutdown 'systemctl poweroff' \
+      --power-reboot 'systemctl reboot'
+  '';
+in {
+  services.greetd = {
+    enable = true;
+    settings = {
+      default_session = {
+        command = "${tuigreet-launch}";
+        user = "greeter";
+      };
+    };
+  };
+
+  # this is a life saver.
+  # literally no documentation about this anywhere.
+  # might be good to write about this...
+  # https://www.reddit.com/r/NixOS/comments/u0cdpi/tuigreet_with_xmonad_how/
+  systemd.services.greetd.serviceConfig = {
+    Type = "idle";
+    StandardInput = "tty";
+    StandardOutput = "tty";
+    StandardError = "journal"; # Without this errors will spam on screen
+    # Without these bootlogs will spam on screen
+    TTYReset = true;
+    TTYVHangup = true;
+    TTYVTDisallocate = true;
+  };
+
+  environment.systemPackages = [tuigreet];
+}