Replaced the childish animal emoji avatars with custom inline-SVG "deity
medallions" (gradient disc + gold ring + heraldic emblem) — Athena, Zeus,
Poseidon, Horus, Odin, Thor, Cyrus, Simorgh, Ishtar, Nike, etc. IDs unchanged
so owned avatars keep working; Avatar renders the art (emoji fallback for legacy
ids). Shop now shows the art + the god name (was generic "Avatar").
Files: components/online/avatarArt.tsx (new art + pantheon map), Avatar.tsx
(render art), ShopScreen Preview (avatar → <Avatar/>), mock-service avatar shop
names from AVATAR_ART.
Verified: tsc + next build clean; web rebuilt on :1500.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>