feat: add web backend — Express REST API, WebSocket, full wiring in entry point

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/web/websocket.ts

@@ -0,0 +1,70 @@
+import { WebSocketServer, WebSocket } from "ws";
+import type { BotManager } from "../bot/manager.js";
+import type { Logger } from "../logger.js";
+
+export function setupWebSocket(
+  wss: WebSocketServer,
+  botManager: BotManager,
+  logger: Logger
+): void {
+  const clients = new Set<WebSocket>();
+
+  wss.on("connection", (ws) => {
+    clients.add(ws);
+    logger.debug("WebSocket client connected");
+
+    const bots = botManager.getAllBots().map((b) => b.getStatus());
+    ws.send(JSON.stringify({ type: "init", bots }));
+
+    ws.on("close", () => {
+      clients.delete(ws);
+      logger.debug("WebSocket client disconnected");
+    });
+
+    ws.on("error", (err) => {
+      logger.error({ err }, "WebSocket error");
+      clients.delete(ws);
+    });
+  });
+
+  const broadcast = (data: object) => {
+    const message = JSON.stringify(data);
+    for (const client of clients) {
+      if (client.readyState === WebSocket.OPEN) {
+        client.send(message);
+      }
+    }
+  };
+
+  const attachBotListeners = () => {
+    for (const bot of botManager.getAllBots()) {
+      bot.removeAllListeners("stateChange");
+      bot.removeAllListeners("connected");
+      bot.removeAllListeners("disconnected");
+
+      bot.on("stateChange", () => {
+        broadcast({
+          type: "stateChange",
+          botId: bot.id,
+          status: bot.getStatus(),
+          queue: bot.getQueue(),
+        });
+      });
+
+      bot.on("connected", () => {
+        broadcast({
+          type: "botConnected",
+          botId: bot.id,
+          status: bot.getStatus(),
+        });
+      });
+
+      bot.on("disconnected", () => {
+        broadcast({ type: "botDisconnected", botId: bot.id });
+      });
+    }
+  };
+
+  setInterval(attachBotListeners, 5000);
+  attachBotListeners();
+}