feat: enable mDNS (Avahi) and local reverse proxy for sovransystemsos.local

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/4159c571-2bfb-48fc-a6bc-e0765ef88ef6

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

configuration.nix

@@ -28,15 +28,25 @@
   };
 
   # ── Networking ──────────────────────────────────────────────
-  networking.hostName = "nixos";
+  networking.hostName = "sovransystemsos";
   networking.networkmanager.enable = true;
   networking.firewall.enable = true;
   networking.firewall.allowedTCPPorts = [ 80 443 8448 3051 ];
-  networking.firewall.allowedUDPPorts = [ 80 443 8448 3051 ];
+  networking.firewall.allowedUDPPorts = [ 80 443 8448 3051 5353 ];
   networking.firewall.allowedUDPPortRanges = [
     { from = 49152; to = 65535; }
   ];
 
+  # ── mDNS / Avahi (sovransystemsos.local) ──────────────────
+  services.avahi = {
+    enable = true;
+    nssmdns4 = true;
+    publish = {
+      enable = true;
+      addresses = true;
+    };
+  };
+
   # ── Locale / Time ──────────────────────────────────────────
   time.timeZone = "America/Los_Angeles";
   i18n.defaultLocale = "en_US.UTF-8";

modules/core/caddy.nix

@@ -145,6 +145,14 @@ $HAVEN {
 EOF
       fi
 
+      # ── Sovran Hub (LAN mDNS access) ────────────────
+      cat >> /run/caddy/Caddyfile <<EOF
+
+http://sovransystemsos.local {
+  reverse_proxy localhost:8937
+}
+EOF
+
       # ── RTL (LAN access) ────────────────────────────
       cat >> /run/caddy/Caddyfile <<EOF