feat: 完善平台总后台模块

backend/api/internal/models/wallet_ledger.go

@@ -0,0 +1,16 @@
+package models
+
+import "git.apinb.com/bsm-sdk/core/database"
+
+// WalletLedger 对应 wallet_ledger，保存不可变资金流水。
+type WalletLedger struct {
+	Entity
+	WalletID          uint64 `gorm:"column:wallet_id;not null;index" json:"wallet_id"`
+	Amount            int64  `gorm:"column:amount;not null" json:"amount"`
+	Direction         string `gorm:"column:direction;type:varchar(16);not null" json:"direction"`
+	BalanceAfter      int64  `gorm:"column:balance_after;not null" json:"balance_after"`
+	ReferenceIdentity string `gorm:"column:reference_identity;type:varchar(36);not null;default:'';index" json:"reference_identity"`
+}
+
+func init()                                   { database.AppendMigrate(&WalletLedger{}) }
+func (table *WalletLedger) TableName() string { return "wallet_ledger" }