feat(WHE-21): scaffold grammy webhook bot server

apps/bot/src/index.ts

@@ -1,7 +1,28 @@
-const startupMessage = '@household/bot scaffold is ready'
+import { webhookCallback } from 'grammy'
+
+import { createTelegramBot } from './bot'
+import { getBotRuntimeConfig } from './config'
+import { createBotWebhookServer } from './server'
+
+const runtime = getBotRuntimeConfig()
+const bot = createTelegramBot(runtime.telegramBotToken)
+const webhookHandler = webhookCallback(bot, 'std/http')
+
+const server = createBotWebhookServer({
+  webhookPath: runtime.telegramWebhookPath,
+  webhookSecret: runtime.telegramWebhookSecret,
+  webhookHandler
+})
 
 if (import.meta.main) {
-  console.log(startupMessage)
+  Bun.serve({
+    port: runtime.port,
+    fetch: server.fetch
+  })
+
+  console.log(
+    `@household/bot webhook server started on :${runtime.port} path=${runtime.telegramWebhookPath}`
+  )
 }
 
-export { startupMessage }
+export { server }