Was broken: demo-withdraw stripped :443 from libeufin’s taler://withdraw
host, so the main bank.hacktivism.ch QR / taler-integration link failed.
Also emit auto-account payto://x-taler-bank/host:443/… and absolute
https://bank.hacktivism.ch/webui/ (no relative /intro/ base confusion).
Personal auto-accounts use usernames of the form goa-bank-acc- plus a random
hex id so they are easy to spot in admin lists and distinct from explorer
or hand-registered users.
Add GET /intro/auto-account.json on the bank helper (demo-withdraw-api):
public registration with generated username/password, balance starts GOA:0,
credentials returned once for the client to display.
Nginx proxies the new path; install-demo-withdraw-api.sh installs the
location. This is separate from the shared explorer demo withdraw.
