refactor(websocket): move websocket logic to its own module

server/modules/websocket/services/websocket-state.service.ts

@@ -0,0 +1,16 @@
+import type { RealtimeClientConnection } from '@/shared/types.js';
+
+/**
+ * Numeric readyState for an open WebSocket connection.
+ *
+ * We keep this in module state so services that broadcast updates do not need
+ * to import `ws` directly just to compare open/closed state.
+ */
+export const WS_OPEN_STATE = 1;
+
+/**
+ * Shared registry of active chat WebSocket connections.
+ *
+ * Project/session services publish realtime updates by iterating this set.
+ */
+export const connectedClients = new Set<RealtimeClientConnection>();