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/default-creds.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  inputs,
+  lib,
+  ...
+}: let
+  inherit (import ./mk-container.nix {inherit lib config;}) mkContainer;
+  domain = config.var.domain;
+in {
+  imports = [
+    (mkContainer {
+      name = "def-creds";
+      hostIp = "10.233.6.1";
+      containerIp = "10.233.6.2";
+      nixosConfig = {...}: {
+        imports = [inputs.default-creds.nixosModules.default];
+        services.default-creds = {
+          enable = true;
+          port = 8087;
+        };
+        networking.firewall.allowedTCPPorts = [8087];
+        systemd.services.default-creds.environment = {
+          HOST = lib.mkForce "0.0.0.0";
+          PUBLIC_UMAMI_URL = "https://umami.${domain}";
+          PUBLIC_UMAMI_WEBSITE_ID = "7197484c-01ad-488e-9caa-5ab7b7595f08";
+          UMAMI_URL = "https://umami.${domain}";
+          UMAMI_WEBSITE_ID = "7197484c-01ad-488e-9caa-5ab7b7595f08";
+        };
+        system.stateVersion = "24.05";
+      };
+    })
+  ];
+
+  services.default-creds.enable = lib.mkForce false;
+  services.cloudflared.tunnels."${config.var.tunnelId}".ingress."default-creds.${config.var.domain}" = "http://10.233.6.2:8087";
+}