cleanup(#1014): remove manager pinning from frontend — no special treatment for ruth

hive-c0re/src/dashboard.rs

@@ -173,9 +173,6 @@ struct StateSnapshot {
     /// "apply everything you've buffered".
     seq: u64,
     hostname: String,
-    /// The logical name of the manager agent. Lets the dashboard identify
-    /// the manager container without a separate `is_manager` bool on each row.
-    manager_name: String,
     manager_port: u16,
     any_stale: bool,
     containers: Vec<ContainerView>,
@@ -449,7 +446,6 @@ async fn api_state(headers: HeaderMap, State(state): State<AppState>) -> axum::J
     axum::Json(StateSnapshot {
         seq,
         hostname,
-        manager_name: MANAGER_NAME.to_owned(),
         manager_port: lifecycle::agent_web_port(MANAGER_NAME),
         any_stale,
         containers,