WALLET_RIAL -> WALLET_RIAL_DEPOSIT, WALLET_REWARD -> WALLET_USER_BILLBOARD_VISIT_INCOME
to match the naming used for the same wallet-service UUIDs in the advertising/settlement
repos. Also introduces WALLET_PROMOTION as this service's own pool and routes
Promotion.promote()'s payer_wallet through it instead of reusing the payee's
WALLET_REWARD value.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
