Revert "feat(loyalty): EnakPoint & EnakCoin" (#32)

This reverts merge commit 645da30, returning main to f0ff59f.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/contract/wallet_contract.go

@@ -1,31 +0,0 @@
-package contract
-
-// AdjustCustomerWalletRequest is POST /marketing/customers/:id/wallet/adjust
-// (docs/prd-point-coin.md F7).
-type AdjustCustomerWalletRequest struct {
-	// POINT or COIN.
-	Currency string `json:"currency"`
-	// Signed: positive adds to the balance, negative takes from it. Never zero.
-	Amount int64  `json:"amount"`
-	Reason string `json:"reason"`
-	// Optional. Sending the same key again returns the first result instead of
-	// adjusting twice, so a retried request is safe.
-	IdempotencyKey string `json:"idempotency_key"`
-}
-
-// ExchangeCoinsRequest is POST /customer/wallet/exchange (docs/prd-point-coin.md F4).
-// The Idempotency-Key header is required.
-type ExchangeCoinsRequest struct {
-	Coins int64  `json:"coins" binding:"required,min=1"`
-	Pin   string `json:"pin" binding:"required"`
-}
-
-// TransferWalletRequest is POST /customer/wallet/transfer (docs/prd-point-coin.md F5).
-// The Idempotency-Key header is required.
-type TransferWalletRequest struct {
-	// POINT or COIN.
-	Currency       string `json:"currency" binding:"required"`
-	Amount         int64  `json:"amount" binding:"required,min=1"`
-	RecipientPhone string `json:"recipient_phone" binding:"required"`
-	Pin            string `json:"pin" binding:"required"`
-}