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/group/flake.nix

@@ -0,0 +1,22 @@
+{
+  inputs,
+  pkgs,
+  pkgs-stable,
+  pkgs-nur-hadi,
+  system,
+  ...
+}: let
+  devPackages = import ./dev-packages.nix {inherit pkgs pkgs-stable;};
+  cyberPackages = import ./cybersecurity-packages.nix {inherit pkgs pkgs-stable pkgs-nur-hadi;};
+in {
+  packages.${system} = {
+    dev = pkgs.buildEnv {
+      name = "dev-tools";
+      paths = devPackages;
+    };
+    cybersecurity = pkgs.buildEnv {
+      name = "cybersecurity-tools";
+      paths = cyberPackages;
+    };
+  };
+}