feat(infra): expose Argo Workflows UI at ci.fxhnt.ai

Rename DNS record from argo→ci and update nginx proxy server_name
to match. Applied via terragrunt and kubectl.

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

infra/k8s/gitlab/tailscale-proxy.yaml

@@ -302,10 +302,10 @@ data:
         }
     }
 
-    # Argo Workflows UI — argo.fxhnt.ai
+    # Argo Workflows UI — ci.fxhnt.ai
     server {
         listen 443 ssl;
-        server_name argo.fxhnt.ai;
+        server_name ci.fxhnt.ai;
 
         ssl_certificate /etc/nginx/certs/tls.crt;
         ssl_certificate_key /etc/nginx/certs/tls.key;

infra/modules/dns/main.tf

@@ -56,9 +56,9 @@ resource "scaleway_domain_record" "s3" {
   ttl      = 300
 }
 
-resource "scaleway_domain_record" "argo" {
+resource "scaleway_domain_record" "ci" {
   dns_zone = var.dns_zone
-  name     = "argo"
+  name     = "ci"
   type     = "A"
   data     = var.git_ip
   ttl      = 300