Spoolman leads CC2 Control's copies; new spools from the bridge

- Master data of CC2 Control's copies follows Spoolman (name, brand,
  colour, diameter, density, net, tare, price; not the material, which was
  fitted to the tray).
- A loaded spool's rest in CC2 Control is set to Spoolman's via
  /api/spools/adjust once everything is booked (old copy after the roll
  printed in the other printer, weigh-in in Spoolman); the resulting
  correction is not booked back.
- Copies of spools archived or deleted in Spoolman are deleted from CC2
  Control when no tray holds them (library limit 128); an outage never
  counts as deleted.
- A roll that ran out is archived in Spoolman (setting, default on); a
  scan of an archived spool maps nothing.
- A roll scanned again with unchanged tag data and put back into its old
  slot (after printing in the other printer) is recognised.
- Tag generator: "Neue Spule" creates spools in Spoolman from an existing
  or a new filament (and vendor), labelled vendor + id, then opens the tag.

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

app/templates/settings.html

@@ -51,6 +51,7 @@ details.pr[open] > summary .chev { transform: rotate(90deg); }
       <div class="frow"><label for="location_slot">Ort im Slot<small><code>{printer}</code> = Druckername, <code>{n}</code> = 1–4</small></label><input id="location_slot" required></div>
       <div class="frow"><label for="location_storage">Ort im Lager</label><input id="location_storage" required></div>
       <div class="frow"><label for="spoolman_fields">Zusatzfelder „Drucker“ und „Slot“ in Spoolman pflegen</label><span class="switch"><input type="checkbox" id="spoolman_fields"><span></span></span></div>
+      <div class="frow"><label for="archive_empty">Leergelaufene Rollen in Spoolman archivieren<small>Ihre Kopie in CC2 Control wird danach gelöscht</small></label><span class="switch"><input type="checkbox" id="archive_empty"><span></span></span></div>
     </div>
 
     <div class="label section-label">Abfrage</div>
@@ -147,6 +148,7 @@ async function loadSettings() {
   current = await api('GET', '/api/settings');
   for (const f of FIELDS) $(f).value = current[f];
   $('spoolman_fields').checked = current.spoolman_fields;
+  $('archive_empty').checked = current.archive_empty;
   printers = current.printers.map((p) => ({ ...p }));
   saved = new Set(printers.map((p) => p.id));
   showMode(current.dry_run);
@@ -156,6 +158,7 @@ async function saveSettings() {
   const body = { printers };
   for (const f of FIELDS) body[f] = $(f).value;
   body.spoolman_fields = $('spoolman_fields').checked;
+  body.archive_empty = $('archive_empty').checked;
   try {
     current = await api('POST', '/api/settings', body);
     printers = current.printers.map((p) => ({ ...p }));