feat(auth): point dev clusters at shared GLAuth 10.100.0.35; retire local scadabridge-ldap

Both :9000 (docker) and :9100 (docker-env2) central nodes now bind the shared dev
GLAuth (scadaproj/infra/glauth/, dc=zb,dc=local) via the cn=serviceaccount search
account instead of the bundled scadabridge-ldap container (now commented out in
infra/docker-compose.yml, kept for rollback). Verified: multi-role -> all 4 roles
on both clusters with scadabridge-ldap stopped.

docker-env2/central-node-a/appsettings.Central.json

@@ -23,13 +23,13 @@
     },
     "Security": {
       "Ldap": {
-        "Server": "scadabridge-ldap",
+        "Server": "10.100.0.35",
         "Port": 3893,
         "Transport": "None",
         "AllowInsecure": true,
         "SearchBase": "dc=zb,dc=local",
-        "ServiceAccountDn": "cn=admin,dc=zb,dc=local",
-        "ServiceAccountPassword": "password"
+        "ServiceAccountDn": "cn=serviceaccount,dc=zb,dc=local",
+        "ServiceAccountPassword": "serviceaccount123"
       },
       "JwtSigningKey": "scadabridge-env2-dev-jwt-signing-key-must-be-at-least-32-characters-long",
       "JwtExpiryMinutes": 15,