init: 初始化 AssetX 项目仓库

包含 webapp（Next.js 用户端）、webapp-back（Go 后端）、
antdesign（管理后台）、landingpage（营销落地页）、
数据库 SQL 和配置文件。

webapp-back/models/known_borrower.go

@@ -0,0 +1,17 @@
+package models
+
+import "time"
+
+// KnownBorrower stores every address that has ever interacted with the lending contract.
+// The liquidation bot checks ALL known borrowers for isLiquidatable on every tick,
+// so accounts whose health factor drops due to oracle price changes are still caught
+// even if they haven't had a recent on-chain transaction.
+type KnownBorrower struct {
+	ID          uint      `gorm:"primaryKey;autoIncrement" json:"id"`
+	ChainID     int       `gorm:"uniqueIndex:idx_known_borrower" json:"chain_id"`
+	Address     string    `gorm:"size:42;uniqueIndex:idx_known_borrower" json:"address"`
+	FirstSeenAt time.Time `json:"first_seen_at"`
+	LastSeenAt  time.Time `json:"last_seen_at"`
+}
+
+func (KnownBorrower) TableName() string { return "known_borrowers" }