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/docker-compose.yml

@@ -30,8 +30,11 @@ services:
     depends_on:
       db:
         condition: service_healthy
+      quickadd:
+        condition: service_started
     environment:
       TZ: ${TZ:-UTC}
+      KOHA_QUICKADD_URL: http://quickadd:8082
       KOHA_DB_HOST: db
       KOHA_DB_PASS: ${DB_PASSWORD}
       KOHA_ADMIN_USER: ${ADMIN_USER:-admin}
@@ -53,9 +56,6 @@ services:
     image: library-quickadd:local
     container_name: library-quickadd
     restart: unless-stopped
-    depends_on:
-      koha:
-        condition: service_started
     environment:
       TZ: ${TZ:-UTC}
       KOHA_API: http://koha:8081/api/v1