feat(credential): implement credential peer auth and trust propagation (#1968)

- add credential manager and RPC/CLI for generate/list/revoke
- support credential-based Noise authentication and revocation handling
- propagate trusted credential metadata through OSPF route sync
- classify direct peers by auth level in session maintenance
- normalize sender credential flag for legacy non-secure compatibility
- add unit/integration tests for credential join, relay and revocation

easytier/src/rpc_service/mod.rs

@@ -2,6 +2,7 @@ mod acl_manage;
 mod api;
 mod config;
 mod connector_manage;
+mod credential_manage;
 mod mapped_listener_manage;
 mod peer_center;
 mod peer_manage;
@@ -76,6 +77,11 @@ pub trait InstanceRpcService: Sync + Send {
             > + Send
             + Sync,
     >;
+    fn get_credential_manage_service(
+        &self,
+    ) -> &dyn crate::proto::api::instance::CredentialManageRpc<
+        Controller = crate::proto::rpc_types::controller::BaseController,
+    >;
 }
 
 fn get_instance_service(