fix(telegram): handle network errors gracefully

- Add bot.catch() to prevent unhandled rejections from middleware
- Add isRecoverableNetworkError() to retry on transient failures
- Add maxRetryTime and exponential backoff to grammY runner
- Global unhandled rejection handler now logs recoverable errors
  instead of crashing (fetch failures, timeouts, connection resets)

Fixes crash loop when Telegram API is temporarily unreachable.

src/telegram/fetch.ts

@@ -1,5 +1,17 @@
+import { setDefaultAutoSelectFamily } from "net";
 import { resolveFetch } from "../infra/fetch.js";
 
+// Workaround for Node.js 22 "Happy Eyeballs" (autoSelectFamily) bug
+// that causes intermittent ETIMEDOUT errors when connecting to Telegram's
+// dual-stack servers. Disabling autoSelectFamily forces sequential IPv4/IPv6
+// attempts which works reliably.
+// See: https://github.com/nodejs/node/issues/54359
+try {
+  setDefaultAutoSelectFamily(false);
+} catch {
+  // Ignore if not available (older Node versions)
+}
+
 // Prefer wrapped fetch when available to normalize AbortSignal across runtimes.
 export function resolveTelegramFetch(proxyFetch?: typeof fetch): typeof fetch | undefined {
   if (proxyFetch) return resolveFetch(proxyFetch);