chore(auth): ScadaBridge unify dev LDAP base DN to dc=zb,dc=local (Task 1.6)

Replace dc=scadabridge,dc=local with dc=zb,dc=local in all dev/test LDAP
references — app config, docker test-cluster node configs (docker/ and
docker-env2/), GLAuth fixture, dev tooling, Host.Tests fixtures,
IntegrationTests factory, and operational test_infra docs. OU structure
(ou=SCADA-Admins,ou=users,etc.) preserved throughout. Email domains
(@scadabridge.local), hostnames, and container names are untouched.
Historical plan docs (2026-05-24-second-environment.md,
2026-05-31-folder-repo-rename-scadabridge-design.md) excluded as
point-in-time records. No synthetic dc=example,dc=com placeholders touched.

tests/ZB.MOM.WW.ScadaBridge.IntegrationTests/ScadaBridgeWebApplicationFactory.cs

@@ -45,11 +45,11 @@ public class ScadaBridgeWebApplicationFactory : WebApplicationFactory<Program>
             ["ScadaBridge__Security__Ldap__Port"] = "3893",
             ["ScadaBridge__Security__Ldap__Transport"] = "None",
             ["ScadaBridge__Security__Ldap__AllowInsecure"] = "true",
-            ["ScadaBridge__Security__Ldap__SearchBase"] = "dc=scadabridge,dc=local",
+            ["ScadaBridge__Security__Ldap__SearchBase"] = "dc=zb,dc=local",
             // GLAuth places users at cn=<name>,ou=<group>,ou=users,dc=... — a service
             // account is configured to enable the shared service's search-then-bind:
             // resolve the user's real DN by (UserNameAttribute=<name>) lookup, then bind it.
-            ["ScadaBridge__Security__Ldap__ServiceAccountDn"] = "cn=admin,ou=SCADA-Admins,ou=users,dc=scadabridge,dc=local",
+            ["ScadaBridge__Security__Ldap__ServiceAccountDn"] = "cn=admin,ou=SCADA-Admins,ou=users,dc=zb,dc=local",
             ["ScadaBridge__Security__Ldap__ServiceAccountPassword"] = "password",
         };