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/storage.py

@@ -121,6 +121,7 @@ class Settings:
     spoolman_fields: bool = True  # also write the extra fields "drucker" and "slot"
     empty_grace: float = 20.0  # seconds with tray status 0 before a slot counts as empty
     settle_seconds: float = 60.0  # `remaining` must be unchanged this long before booking
+    archive_empty: bool = True  # archive a Spoolman spool whose roll ran out
     dry_run: bool = True
     printers: list[PrinterConfig] = field(default_factory=list)