feat(proxy): add render_config method and UpstreamService mock

- Add render_config to ProxyServiceTrait and implement it

- Add mockall automock to UpstreamService

- Remove unused OverrideRef import

apps/nxmesh-master/src/service/proxy/upstream/mod.rs

@@ -2,7 +2,7 @@ use sea_orm::{ActiveModelTrait, ActiveValue::Set, DatabaseConnection, EntityTrai
 use uuid::Uuid;
 
 use crate::service::proxy::types::{
-    OverrideRef, ProxyServiceError, ProxyServiceResult, UpstreamConfig,
+    ProxyServiceError, ProxyServiceResult, UpstreamConfig,
 };
 
 pub struct CreateUpstreamParams {
@@ -34,6 +34,7 @@ fn model_to_config(model: crate::db::entities::upstream::Model) -> UpstreamConfi
     }
 }
 
+#[cfg_attr(test, mockall::automock)]
 #[async_trait::async_trait]
 pub trait UpstreamService: Send + Sync + 'static {
     async fn get(&self, id: Uuid) -> ProxyServiceResult<UpstreamConfig>;