Amolen matte updates

[crzykidd]

Fills out the four Amolen PLA Matte product lines with print specifications, photos, and
1kg packages, and backfills specs on discontinued colors.

Live products — full update (20 colors)

• PLA Matte Basic (4): Navy Blue, Porcelain White, Sand Beige, Terracotta
• PLA Matte Dual (7): Blue Pink, Brown White, Cyan Chartreuse, Green Purple, Peach Gold, Pink Purple, Red Gold
• PLA Matte Triple (3): Pink Cyan Chartreuse, Red Yellow Blue, White Pink Purple
• PLA Matte Rainbow (6): Candy, Lemon Mint, Multicolor, Pastel Berry, Rosy, Sunset

Each got print/bed temperatures and drying settings (nozzle 190–230 °C, bed
30–65 °C, drying 55 °C for 480 min), density 1.24, the product line url, a photo
where missing, and a new 1kg package (linked to amolen-spool-1kg, 1.75 mm).

Discontinued Basic colors (14)

• Specs only (temps/drying + density 1.24); existing photos kept; no packages, as
  these are no longer listed for sale but may still be in use.

Packages (20, new)

• 1kg packages for all current colors, with per-variant product URLs. GTIN-less for now.