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.

home/system/hyprland/keyboard-backlight.nix

@@ -0,0 +1,44 @@
+# Turn the keyboard red/off when the battery is low
+# Include this one only if you have a omen laptop with RGB keyboard
+{
+  pkgs,
+  config,
+  ...
+}: let
+  alert-when-low-battery = false;
+  keyboard-backlight = pkgs.writeShellScriptBin "keyboard-backlight" ''
+    function set_keyboard_backlight {
+      local color=$1
+        echo $color > /sys/devices/platform/hp-wmi/rgb_zones/zone00
+        echo $color > /sys/devices/platform/hp-wmi/rgb_zones/zone01
+        echo $color > /sys/devices/platform/hp-wmi/rgb_zones/zone02
+        echo $color > /sys/devices/platform/hp-wmi/rgb_zones/zone03
+    }
+    state="white"
+    set_keyboard_backlight ${config.lib.stylix.colors.base0D}
+    if [ "${toString alert-when-low-battery}" = "false" ]; then
+      exit 0
+    fi
+    while true; do
+      BATTERY_LEVEL=$(cat /sys/class/power_supply/BAT*/capacity)
+      IS_CHARGING=$(cat /sys/class/power_supply/BAT*/status)
+      if [[ $BATTERY_LEVEL -le 10 && $IS_CHARGING != "Charging" ]]; then
+        if [[ $state == "red" ]];then
+          state="white"
+          set_keyboard_backlight "000000"
+        else
+          state="red"
+          set_keyboard_backlight "FF0000"
+        fi
+      else
+        state="white"
+        set_keyboard_backlight ${config.lib.stylix.colors.base0D}
+      fi
+      sleep 2
+    done
+  '';
+
+  command = "bash ${keyboard-backlight}/bin/keyboard-backlight &";
+in {
+  wayland.windowManager.hyprland.settings.exec-once = [command];
+}