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/install.sh

@@ -8,6 +8,9 @@
 #
 # Optional environment variables:
 #   LIBRARY_NAME="Smith Family Library"   name shown on the catalogue
+#   LIBRARY_CODE=HOME                     short code for the library (letters/digits)
+#   SHELVES="LR=Living room;BR=Bedroom"   shelves/rooms to offer (first install only)
+#   ITEM_TYPES="CD=Compact disc"          extra item types (first install only)
 #   OPAC_PORT=8080 STAFF_PORT=8081        preferred host ports (next free is used)
 #   EXTRA_CA=/path/to/proxy-ca.crt        trust an extra CA while building
 set -euo pipefail
@@ -106,6 +109,9 @@ if [ ! -f .env ]; then
     cat > .env << ENVEOF
 # Generated by install.sh - keep this file private.
 LIBRARY_NAME="${LIBRARY_NAME:-My Library}"
+LIBRARY_CODE=${LIBRARY_CODE:-HOME}
+SHELVES="${SHELVES:-}"
+ITEM_TYPES="${ITEM_TYPES:-}"
 TZ=${TZ_NOW}
 OPAC_PORT=$(free_port "${OPAC_PORT:-8080}")
 STAFF_PORT=$(free_port "${STAFF_PORT:-8081}")