library: barcode modes, patrons/lending, install-time shelves and item types

Quick Add:
- barcode choices: automatic (zero-padded, >= 7 digits), scan a pre-printed
  sticker per item, or none for now; bulk 'give barcodes to items without one';
  reserve a block of numbers and print the sheet ahead of time (link opens
  Koha's range printer prefilled)
- default shelf saved on the server (shared by every device)
- item types follow Koha; CSP allows cover redirects; aria attrs fixed

Koha bootstrap:
- default lending rule (3 weeks, 25 items, 3 renewals, no fines) - a fresh
  Koha refuses every checkout without one
- automatic library-card numbers (start at 1000001), fines off
- Koha's own auto-barcode off (one numbering scheme)
- patron card template (Avery 5371) and layout with a scannable barcode
- LIBRARY_CODE, SHELVES and ITEM_TYPES honoured at first install

Why 7 digits: decoded printed sheets - 7-digit Code 39 read back 40/40, 6-digit
all-numeric symbols were reinterpreted as Code 32 for ~1 in 10 values.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013wi3ZSot4XbUViwRFgLpRf

library/koha/entrypoint.sh

@@ -81,7 +81,8 @@ if [ "$TABLES" = "0" ]; then
     runuser -u "$INST-koha" -- env \
         KOHA_CONF="/etc/koha/sites/$INST/koha-conf.xml" PERL5LIB=/usr/share/koha/lib \
         KOHA_ADMIN_USER="${KOHA_ADMIN_USER:-admin}" KOHA_ADMIN_PASS="$KOHA_ADMIN_PASS" \
-        KOHA_LIBRARY_NAME="${KOHA_LIBRARY_NAME:-My Library}" TZ="$TZ" \
+        KOHA_LIBRARY_NAME="${KOHA_LIBRARY_NAME:-My Library}" KOHA_LIBRARY_CODE="${KOHA_LIBRARY_CODE:-HOME}" \
+        KOHA_SHELVES="${KOHA_SHELVES:-}" KOHA_ITEM_TYPES="${KOHA_ITEM_TYPES:-}" TZ="$TZ" \
         perl /opt/koha-init/bootstrap.pl
     TABLES=$(mariadb -N -h "$DB_HOST" -u "$DB_USER" -p"$KOHA_DB_PASS" "$DB_NAME" \
         -e "select count(*) from information_schema.tables where table_schema='$DB_NAME'")