feat/fix: implement WebSockets for NowPlaying, better data fetching with addl. Last.fm fetch, docker build fix

server.ts

@@ -0,0 +1,45 @@
+import { createServer } from "node:http";
+import next from "next";
+import { Server } from "socket.io";
+import { NowPlayingService } from "./lib/now-playing-server";
+
+const dev = process.env.NODE_ENV !== "production";
+const hostname = "localhost";
+const port = parseInt(process.env.PORT || "3000", 10);
+
+const app = next({ dev, hostname, port });
+const handler = app.getRequestHandler();
+
+app.prepare().then(() => {
+  const httpServer = createServer(handler);
+  const io = new Server(httpServer);
+
+  const nowPlayingService = new NowPlayingService(io);
+
+  io.on("connection", (socket) => {
+    console.log("[WS] Client connected:", socket.id);
+
+    socket.on("requestNowPlaying", async () => {
+      await nowPlayingService.fetchNowPlaying(socket.id);
+    });
+
+    socket.on("startAutoRefresh", () => {
+      const intervalId = setInterval(async () => {
+        await nowPlayingService.fetchNowPlaying(socket.id);
+      }, 30000);
+
+      socket.on("disconnect", () => {
+        clearInterval(intervalId);
+        console.log("[WS] Client disconnected:", socket.id);
+      });
+    });
+
+    socket.on("disconnect", () => {
+      console.log("[WS] Client disconnected:", socket.id);
+    });
+  });
+
+  httpServer.listen(port, () => {
+    console.log(`✓ Ready on http://${hostname}:${port}`);
+  });
+});