fix(beads-server): persist GRAPHQLAPI_URL in Terraform

The env var was only set via kubectl and got overwritten on next apply.
Now permanently in the deployment spec.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

stacks/beads-server/main.tf

@@ -280,6 +280,10 @@ resource "kubernetes_deployment" "workbench" {
             name  = "NODE_OPTIONS"
             value = "--dns-result-order=ipv4first"
           }
+          env {
+            name  = "GRAPHQLAPI_URL"
+            value = "https://dolt-workbench.viktorbarzin.me/graphql"
+          }
 
           volume_mount {
             name       = "store"