feat(events): stream Redis invalidations over SSE

app/api/events/directory/route.ts

@@ -0,0 +1,12 @@
+import {
+  createRedisEventResponse,
+  eventsUnavailableResponse,
+} from "@/lib/events/redis-stream";
+
+export async function GET(request: Request) {
+  try {
+    return await createRedisEventResponse("directory", request.signal);
+  } catch {
+    return eventsUnavailableResponse();
+  }
+}