Add modular service configuration with SearXNG and Nginx

- Create modules/ directory with reusable NixOS modules
- Add system module for main user configuration
- Add podman module for rootless container support
- Add nginx module with automatic Let's Encrypt SSL
- Add searxng module with Anubis AI firewall protection
- Configure SearXNG at search.ashisgreat.xyz
- Enable nginx reverse proxy with HTTPS

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

configuration.nix

@@ -14,7 +14,7 @@
   # === Firewall ===
   networking.firewall = {
     enable = true;
-    allowedTCPPorts = [ 22 ]; # SSH
+    allowedTCPPorts = [ 22 ]; # SSH (80/443 added by nginx module)
     allowPing = false;
   };
 
@@ -67,4 +67,23 @@
   ];
 
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # === SearXNG ===
+  myModules.searxng = {
+    enable = true;
+    port = 8888;
+    domain = "search.ashisgreat.xyz"; # Change to your domain
+    instanceName = "Ashie Search";
+  };
+
+  # === Nginx Reverse Proxy ===
+  myModules.nginx = {
+    enable = true;
+    email = "info@ashisgreat.xyz";
+    domains = {
+      "search.ashisgreat.xyz" = {
+        port = 8888;
+      };
+    };
+  };
 }