library: one address - Add books inside the staff site, plus Find a book

- Apache in the Koha container serves Quick Add at /add/ on the staff site
  (KOHA_QUICKADD_URL); koha now starts after quickadd so the name resolves
- Quick Add: relative API paths so it works at / and /add/; Add books / Find a
  book tabs; search by title, author or ISBN showing each copy's shelf and status
  (/api/search); Manage and Public catalogue links
- staff home gets a 'Library tools' block (HTML customizations, how Koha 26.05
  stores it) linking to Add books
- installer, kiosk add-on and READMEs advertise one main address; the public
  catalogue stays on its own port (Koha gives public and staff sites the same URL
  shapes, so they cannot share one address)

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

library/koha/entrypoint.sh

@@ -56,6 +56,20 @@ if [ ! -d "/etc/koha/sites/$INST" ]; then
         -e 's|^#\s*Include /etc/koha/apache-shared-intranet-plack.conf|   Include /etc/koha/apache-shared-intranet-plack.conf|' "$SITE"
     koha-plack --enable "$INST" >/dev/null 2>&1 || true   # koha-create may already have enabled it
 
+    # One address: serve the Add books page (Quick Add) inside the staff site at /add/.
+    # (The staff and public catalogue sites cannot share one address: Koha gives both the
+    # same URL shapes. The staff site is the natural home for a home library.)
+    if [ -n "${KOHA_QUICKADD_URL:-}" ]; then
+        cat > /etc/koha/apache-quickadd.conf << APACHE
+<IfModule mod_proxy_http.c>
+    RedirectMatch ^/add\$ /add/
+    ProxyPass /add/ ${KOHA_QUICKADD_URL%/}/
+    ProxyPassReverse /add/ ${KOHA_QUICKADD_URL%/}/
+</IfModule>
+APACHE
+        sed -i 's|^\(\s*\)Include /etc/koha/apache-shared-intranet.conf|&\n\1Include /etc/koha/apache-quickadd.conf|' "/etc/apache2/sites-available/$INST.conf"
+    fi
+
     # Run Apache itself as the instance user instead of mpm_itk's per-vhost
     # uid switching (which needs extra capabilities and is pointless here:
     # Plack does the real work as that user already).