Implement Phase 3A playlist management

server/src/runtime.js

@@ -53,13 +53,18 @@ function createRuntime({
     throw error;
   }
   let app;
+  let io = null;
   try {
     app = createApp({
       config,
       database,
       imageProcessor,
       lifecycle,
+      logger,
       migrations,
+      onPlaylistsChanged(event) {
+        io?.emit("playlists:changed", event);
+      },
       storage,
     });
   } catch (error) {
@@ -68,7 +73,7 @@ function createRuntime({
     throw error;
   }
   const httpServer = http.createServer(app);
-  const io = new SocketServer(httpServer, {
+  io = new SocketServer(httpServer, {
     serveClient: false,
   });