First test kinda working

substrate/src/transport/state.rs

@@ -0,0 +1,13 @@
+use bevy::prelude::States;
+
+/// Lifecycle of the QUIC listener inside the ECS schedule.
+///
+/// `Starting` is the default; `OnEnter(Starting)` performs the bind and, on
+/// success, transitions to `Started`. A `Failed` variant will join when we
+/// add proper error surfacing — for now a bind failure panics the app.
+#[derive(States, Debug, Clone, Copy, Default, Eq, PartialEq, Hash)]
+pub enum ServerState {
+    #[default]
+    Starting,
+    Started,
+}