实现租客成长等级并优化展示

backend/internal/model/renter_growth.go

@@ -0,0 +1,22 @@
+package model
+
+import "time"
+
+// RenterGrowthLedger 记录租客成长积分变动流水，便于排查订单完成后的积分发放。
+type RenterGrowthLedger struct {
+	ID           uint64    `gorm:"primaryKey" json:"id"`
+	UserID       uint64    `gorm:"not null;index" json:"user_id"`
+	OrderID      uint64    `gorm:"not null;default:0;index;uniqueIndex:uk_renter_growth_order_source,priority:1" json:"order_id"`
+	Points       int64     `gorm:"not null;default:0" json:"points"`
+	BeforePoints int64     `gorm:"not null;default:0" json:"before_points"`
+	AfterPoints  int64     `gorm:"not null;default:0" json:"after_points"`
+	BeforeLevel  string    `gorm:"size:32;not null;default:'normal'" json:"before_level"`
+	AfterLevel   string    `gorm:"size:32;not null;default:'normal'" json:"after_level"`
+	Source       string    `gorm:"size:32;not null;default:'order_completed';uniqueIndex:uk_renter_growth_order_source,priority:2" json:"source"`
+	Remark       string    `gorm:"size:255;not null;default:''" json:"remark"`
+	CreatedAt    time.Time `json:"created_at"`
+}
+
+func (RenterGrowthLedger) TableName() string {
+	return "renter_growth_ledger"
+}