refactor: route notify dispatch through app context (#3789)

* refactor: route notify dispatch through app context

* refactor: route admin IAM globals through app context (#3791)

* refactor: centralize IAM root credential access (#3792)

crates/protocols/src/common/gateway.rs

@@ -12,7 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use rustfs_credentials;
 use rustfs_policy::policy::action::S3Action as PolicyS3Action;
 use serde_json;
 use std::collections::HashMap;
@@ -299,11 +298,7 @@ pub async fn is_authorized(
     let policy_action: rustfs_policy::policy::action::Action = action.clone().into();
 
     // Check if user is the owner (admin)
-    let is_owner = if let Some(global_cred) = rustfs_credentials::get_global_action_cred() {
-        session_context.principal.access_key() == global_cred.access_key
-    } else {
-        false
-    };
+    let is_owner = rustfs_iam::is_root_access_key(session_context.principal.access_key());
 
     let args = rustfs_policy::policy::Args {
         account: session_context.principal.access_key(),