fix: Clear webhook before polling getUpdates in Telegram setup

If a bot token previously had a webhook configured (e.g. from a prior
install), getUpdates returns nothing and chat ID detection fails.
Adding deleteWebhook call before polling fixes fresh installs that
reuse an existing bot token.

conduit.sh

@@ -5642,6 +5642,8 @@ ${report}"
 }
 
 telegram_get_chat_id() {
+    # Clear any existing webhook so getUpdates works
+    curl -s --max-time 5 "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/deleteWebhook" &>/dev/null
     local response
     response=$(curl -s --max-time 10 --max-filesize 1048576 "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/getUpdates" 2>/dev/null)
     [ -z "$response" ] && return 1