add listener routes for internal service proxying (#793)

crates/brightstaff/src/handlers/agent_selector.rs

@@ -194,6 +194,7 @@ mod tests {
         Listener {
             name: name.to_string(),
             agents: Some(agents),
+            routes: None,
             port: 8080,
             router: None,
         }

crates/brightstaff/src/handlers/integration_tests.rs

@@ -74,6 +74,7 @@ mod tests {
         let listener = Listener {
             name: "test-listener".to_string(),
             agents: Some(vec![agent_pipeline.clone()]),
+            routes: None,
             port: 8080,
             router: None,
         };