更新.gitignore文件，移除不必要的soul-api目录，确保版本控制的清晰性与一致性。

soul-api/internal/model/referral_binding.go

@@ -0,0 +1,22 @@
+package model
+
+import "time"
+
+// ReferralBinding 对应表 referral_bindings
+type ReferralBinding struct {
+	ID                string     `gorm:"column:id;primaryKey;size:50"`
+	ReferrerID        string     `gorm:"column:referrer_id;size:50"`
+	RefereeID         string     `gorm:"column:referee_id;size:50"`
+	ReferralCode      string     `gorm:"column:referral_code;size:20"`
+	Status            *string    `gorm:"column:status;size:20"`
+	BindingDate       time.Time  `gorm:"column:binding_date"`
+	ExpiryDate        time.Time  `gorm:"column:expiry_date"`
+	CommissionAmount  *float64   `gorm:"column:commission_amount;type:decimal(10,2)"`
+	PurchaseCount     *int       `gorm:"column:purchase_count"`                        // 购买次数
+	TotalCommission   *float64   `gorm:"column:total_commission;type:decimal(10,2)"`  // 累计佣金
+	LastPurchaseDate  *time.Time `gorm:"column:last_purchase_date"`                   // 最后购买日期
+	CreatedAt         time.Time  `gorm:"column:created_at"`
+	UpdatedAt         time.Time  `gorm:"column:updated_at"`
+}
+
+func (ReferralBinding) TableName() string { return "referral_bindings" }