chore: change to byte slice

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/churn-server/src/agent.rs

@@ -24,13 +24,6 @@ impl std::ops::Deref for AgentService {
     }
 }
 
-impl Default for AgentService {
-    fn default() -> Self {
-        Self(Arc::new(DefaultAgentService::default()))
-    }
-}
-
-#[derive(Default)]
 struct DefaultAgentService {
     agents: Db,
 }