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/entities/loyalty_setting_change.go

@@ -1,34 +0,0 @@
-package entities
-
-import (
-	"time"
-
-	"github.com/google/uuid"
-	"gorm.io/gorm"
-)
-
-// LoyaltySettingChange records one change to a loyalty setting: which key, from what,
-// to what, by whom (docs/prd-point-coin.md F2). Append-only.
-type LoyaltySettingChange struct {
-	ID             uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
-	OrganizationID uuid.UUID `gorm:"type:uuid;not null" json:"organization_id"`
-	// Nil for an organization setting.
-	OutletID *uuid.UUID `gorm:"type:uuid" json:"outlet_id"`
-	Key      string     `gorm:"not null;size:100" json:"key"`
-	// Nil when the key had no stored value, or has none any more.
-	OldValue  *string   `gorm:"type:text" json:"old_value"`
-	NewValue  *string   `gorm:"type:text" json:"new_value"`
-	ChangedBy uuid.UUID `gorm:"type:uuid;not null" json:"changed_by"`
-	CreatedAt time.Time `gorm:"autoCreateTime" json:"created_at"`
-}
-
-func (c *LoyaltySettingChange) BeforeCreate(tx *gorm.DB) error {
-	if c.ID == uuid.Nil {
-		c.ID = uuid.New()
-	}
-	return nil
-}
-
-func (LoyaltySettingChange) TableName() string {
-	return "loyalty_setting_changes"
-}