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/customer_device_contract.go

@@ -1,11 +0,0 @@
-package contract
-
-// RegisterCustomerDeviceRequest is PUT /customer/devices: the FCM token the customer
-// app got for this device. Send it after login and whenever FCM refreshes the token.
-type RegisterCustomerDeviceRequest struct {
-	DeviceID string `json:"device_id" binding:"required"`
-	FCMToken string `json:"fcm_token" binding:"required"`
-	// android, ios or web.
-	Platform   *string `json:"platform"`
-	AppVersion *string `json:"app_version"`
-}