Order tool v2: step-by-step configurator after mobineko.com/order

User, 19 Oct 2026: build a new version of the order tool like
mobineko.com/order; it should also offer selectable mastering like
brandenburgmastering.com at 60 USD a track.

- New docs/order.html (site /demos/order/): 15-step rail, step panel,
  large live SVG record (colour per disc, translucent, split, splatter,
  marble, colour-in-colour; label, dead wax, jacket view), floating
  quote card with price, ship window and quantity; phone strip and
  bottom bar. Review lists what is missing, itemised quote with basis
  badges, deposit, lead time, ERPNext touchpoints on the simulated
  order. Disabled-not-hidden options with reasons.
- Mastering choice: none, in-house vinyl mastering (5,000 THB a side,
  default), or partner studio (Brandenburg Mastering, Amsterdam, example,
  not contracted) at 60 USD a track (team figure), replacing the in-house
  line.
- Same R list and quote() as artist-order: defaults reproduce 37,836 THB
  per title and the per-copy figures; new lines (repress stamper,
  colour effects, printed inner, finish, obi, bag, shipping) are
  estimates.
- artist-platform.md: the page and the mastering choice; README, landing
  page and site/build.sh entries.
- Checks: pw_order.py 96 checks (parity, partner mastering, 15 steps at
  1440/1024/768/390 dark and light, disabled force-clicks, render sizes
  and fills, uploads, audio readers, share link, place order).

README.md

@@ -204,6 +204,10 @@ The detail lives in dedicated documents:
   (for artists, labels and any other customer), and optionally launch a
   fan-funded campaign that the plant presses and ships to each fan once
   enough have pre-ordered, with refunds if not
+- [Order a record](docs/order.html): the order tool as a step-by-step
+  configurator after the Mobineko pattern (step rail, choices, a large live
+  record picture, running price and ship date, review with what is
+  missing); same price list as the artist demos
 - [Artist ordering demo](docs/artist-order.html): the artist platform as a
   clickable single page: configure a record (jacket with a 3 or 5 mm
   spine), type the track list or drop the master files and artwork
@@ -363,6 +367,7 @@ docs/
 │                          reports (biomass/)
 ├── suppliers/             Supplier contacts, vendor landscape, supplier map,
 │                          Chinese utility suppliers (china-utilities.md)
+├── order.html             Step-by-step order configurator demo page
 ├── artist-order.html      Artist ordering and fan-funding demo page
 ├── artist-platform.md     Upload, price calculator, fan-funded pressing
 ├── biomass.md             Biomass fuel strategy and the 60 rai coppice idea