feat: add setup endpoint to register bot commands and webhook

GET /webhook/setup/:secret registers commands with Telegram
and sets webhook URL in one step.

src/bot-setup.js

@@ -0,0 +1,43 @@
+const TELEGRAM_API = "https://api.telegram.org/bot";
+
+const BOT_COMMANDS = [
+  { command: "start", description: "Subscribe to status notifications" },
+  { command: "stop", description: "Unsubscribe from notifications" },
+  { command: "status", description: "Check current Claude status" },
+  { command: "subscribe", description: "Set notification preferences" },
+];
+
+/**
+ * One-time setup: register bot commands and set Telegram webhook.
+ * GET /webhook/setup/:secret
+ */
+export async function setupBot(c) {
+  const secret = c.req.param("secret");
+  if (secret !== c.env.WEBHOOK_SECRET) {
+    return c.text("Unauthorized", 401);
+  }
+
+  const token = c.env.BOT_TOKEN;
+  const workerUrl = new URL(c.req.url).origin;
+
+  // Set webhook URL
+  const webhookRes = await fetch(`${TELEGRAM_API}${token}/setWebhook`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ url: `${workerUrl}/webhook/telegram` }),
+  });
+  const webhookData = await webhookRes.json();
+
+  // Register bot commands
+  const commandsRes = await fetch(`${TELEGRAM_API}${token}/setMyCommands`, {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ commands: BOT_COMMANDS }),
+  });
+  const commandsData = await commandsRes.json();
+
+  return c.json({
+    webhook: webhookData,
+    commands: commandsData,
+  });
+}