chore: scrub "Lamassu" from shipped labels

The kiosk's <title> still read "Lamassu ATM" — visible as the browser tab
on the public demo, and inherited by the Electron window. The product has
been bitSpire since the rename; Lamassu belongs in the provenance credits
(README, the c0b69d1 boundary note), not on the artifact.

Rename the user-facing labels that ship: the page title, the flake
description (surfaces in `nix flake metadata`), the ISO build banner, the
header comments on the live-USB config / udev rules / app derivation that
land on the machine image, and the workspace packages' descriptions.

Deliberately NOT touched, because they are identifiers rather than labels
and renaming them has deployed-machine consequences:
- VITE_LAMASSU_MACHINE_MODEL / VITE_LAMASSU_FIAT_CODE (provisioned .env)
- LamassuEventKind (exported enum)
- localStorage keys lamassu-theme / lamassu-color-mode (would reset
  every machine's stored theme)
- docker container names + devenv scripts (dev-only)
- the packages/hal Cargo crate name
Hardware names in HAL driver comments ("Lamassu Sintra", "Douro", "Tejo")
stay: those are the physical machines' real names — that IS the credit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013A6683cCHnQxFUosx1krY4

apps/machine/index.html

@@ -18,7 +18,7 @@
       http-equiv="Content-Security-Policy"
       content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; connect-src 'self' ws: wss: http: https:; img-src 'self' data: blob:; font-src 'self'; frame-src 'none'; object-src 'none'"
     />
-    <title>Lamassu ATM</title>
+    <title>bitSpire ATM</title>
     <style>
       /* Prevent text selection and context menu on kiosk */
       * {