fix(m3-atlas): remove netbird-only middleware from dashboard router

Access control is handled at DNS level — dash.m3ta.dev resolves to
Netbird IP (100.81.142.56) which is unreachable from the public internet.
No need for IP whitelist middleware.

hosts/m3-atlas/services/traefik.nix

@@ -56,12 +56,6 @@
           };
         };
         middlewares = {
-          # Hermes Dashboard — Netbird mesh only
-          netbird-only = {
-            ipWhiteList = {
-              sourceRange = ["100.64.0.0/16"];
-            };
-          };
           domain-redirect = {
             redirectRegex = {
               regex = "^https://www\\.m3tam3re\\.com(.*)";
@@ -95,7 +89,6 @@
           hermes-dashboard = {
             rule = "Host(`dash.m3ta.dev`)";
             service = "hermes-dashboard";
-            middlewares = ["netbird-only"];
             entrypoints = ["websecure"];
             tls = {
               certResolver = "godaddy";