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.

server-modules/awesome-wallpapers.nix

@@ -0,0 +1,41 @@
+{
+  config,
+  inputs,
+  lib,
+  ...
+}: let
+  inherit (import ./mk-container.nix {inherit lib config;}) mkContainer;
+in {
+  imports = [
+    (mkContainer {
+      name = "wallpapers";
+      hostIp = "10.233.4.1";
+      containerIp = "10.233.4.2";
+      nixosConfig = {pkgs, ...}: {
+        services.nginx = {
+          enable = true;
+          virtualHosts."wallpapers" = {
+            root = "${inputs.awesome-wallpapers.packages.${pkgs.stdenv.hostPlatform.system}.default}/share/awesome-wallpapers";
+            listen = [
+              {
+                addr = "0.0.0.0";
+                port = 8080;
+              }
+            ];
+            locations."/" = {
+              tryFiles = "$uri $uri/ /index.html";
+            };
+            extraConfig = ''
+              port_in_redirect off;
+              absolute_redirect off;
+            '';
+          };
+        };
+        networking.firewall.allowedTCPPorts = [8080];
+        system.stateVersion = "24.05";
+      };
+    })
+  ];
+
+  services.cloudflared.tunnels."${config.var.tunnelId}".ingress."wallpapers.${config.var.domain}" = "http://10.233.4.2:8080";
+}