Spool page for NFC links, bridge address; vendor-first new spool form

- /s/<id> shows a spool: rest in Spoolman and CC2 Control, where it is,
  last booking, history, links to Spoolman and the tag generator.
- Setting "Adresse der Bridge"; the tag generator can put <address>/s/<id>
  on the tag, so an iPhone held to the roll opens that page.
- New spool: vendor and material chosen from Spoolman, the vendor's
  filaments offered, values taken from similar filaments, duplicates
  pointed out and never created twice.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014GcEk5tkfFSYD6NTF66NkC

app/templates/settings.html

@@ -45,6 +45,11 @@ details.pr[open] > summary .chev { transform: rotate(90deg); }
   <p class="small muted" style="margin:8px 4px 0">Neue oder geänderte Drucker erst speichern, dann „Verbindung testen“.</p>
 
   <form id="settings" onsubmit="event.preventDefault(); saveSettings()">
+    <div class="label section-label">Bridge</div>
+    <div class="group">
+      <div class="frow"><label for="public_url">Adresse der Bridge<small>für den Link auf den NFC-Tags, z. B. https://cc2.menzel.center</small></label><input id="public_url" inputmode="url" autocapitalize="off" spellcheck="false" placeholder="https://…"></div>
+    </div>
+
     <div class="label section-label">Spoolman &amp; Buchung</div>
     <div class="group">
       <div class="frow"><label for="spoolman_url">Spoolman-URL</label><input id="spoolman_url" required inputmode="url" autocapitalize="off" spellcheck="false"></div>
@@ -84,7 +89,7 @@ details.pr[open] > summary .chev { transform: rotate(90deg); }
 {% endblock %}
 {% block script %}
 <script>
-const FIELDS = ['spoolman_url', 'id_offset', 'poll_interval', 'empty_grace', 'settle_seconds', 'location_slot', 'location_storage'];
+const FIELDS = ['public_url', 'spoolman_url', 'id_offset', 'poll_interval', 'empty_grace', 'settle_seconds', 'location_slot', 'location_storage'];
 const PFIELDS = [['name', 'Name'], ['host', 'Drucker-IP'], ['ssh_port', 'SSH-Port'], ['ssh_user', 'SSH-Benutzer'], ['cc2_url', 'CC2-Control-URL']];
 const PRINTER_ICON = '<svg viewBox="0 0 24 24" aria-hidden="true"><path d="M4 4h16v16H4zM4 9h16M10 13h4"/></svg>';
 let current = {}, printers = [], hostKeys = {}, saved = new Set(), openIdx = new Set();