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/programs/nixy/package.nix

@@ -0,0 +1,69 @@
+{
+  pkgs,
+  configDirectory,
+}:
+pkgs.writeShellScriptBin "nixy"
+# bash
+''
+  EXTRA_ARGS="''${@:2}"
+
+  function exec() {
+    $@
+  }
+
+  function ui(){
+    DEFAULT_ICON="󰘳"
+
+    # "icon;name;command"[]
+    apps=(
+      "󰑓;Rebuild;nixy rebuild"
+      "󰐊;Test;nixy test"
+      "󰚰;Update;nixy update"
+      ";Collect Garbage;nixy gc"
+      "󰍜;Clean Boot Menu;nixy cb"
+      ";List generation;nixy listgen"
+    )
+
+    # Apply default icons if empty:
+    for i in "''${!apps[@]}"; do
+      apps[i]=$(echo "''${apps[i]}" | sed 's/^;/'$DEFAULT_ICON';/')
+    done
+
+    fzf_result=$(printf "%s\n" "''${apps[@]}" | awk -F ';' '{print $1" "$2}' | fzf)
+    [[ -z $fzf_result ]] && exit 0
+    fzf_result=''${fzf_result/ /;}
+    line=$(printf "%s\n" "''${apps[@]}" | grep "$fzf_result")
+    command=$(echo "$line" | sed 's/^[^;]*;//;s/^[^;]*;//')
+
+    exec "$command"
+    exit $?
+  }
+
+  [[ $1 == "" ]] && ui
+
+  if [[ $1 == "rebuild" ]];then
+    cd ${configDirectory} && git add . && sudo nixos-rebuild switch --flake . $EXTRA_ARGS
+  elif [[ $1 == "test" ]];then
+    cd ${configDirectory} && git add . && sudo nixos-rebuild test --flake . $EXTRA_ARGS
+  elif [[ $1 == "update" ]];then
+    cd ${configDirectory} && nix flake update $EXTRA_ARGS
+  elif [[ $1 == "gc" ]];then
+    echo "Starting Nix garbage collection..."
+    cd ${configDirectory} && \
+    echo "Cleaning up system garbage..." && \
+    sudo nix-collect-garbage -d && \
+    echo "Cleaning up user garbage..." && \
+    nix-collect-garbage -d && \
+    echo "Collecting garbage from Nix store..." && \
+    nix-store --gc && \
+    echo "Optimizing Nix store..." && \
+    nix-store --optimise
+    echo "Nix garbage collection complete."
+  elif [[ $1 == "cb" ]];then
+    sudo /run/current-system/bin/switch-to-configuration boot
+  elif [[ $1 == "listgen" ]];then
+    sudo nix-env -p /nix/var/nix/profiles/system --list-generations
+  else
+    echo "Unknown argument"
+  fi
+''