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/system_contract.go

@@ -0,0 +1,20 @@
+package models
+
+import "time"
+
+// SystemContract is the central registry for all infrastructure contract addresses.
+// One row per (name, chain_id) pair.
+// Replaces the former alp_pools and lending_markets tables (which had only one row each).
+type SystemContract struct {
+	ID          uint      `gorm:"primaryKey;autoIncrement" json:"id"`
+	Name        string    `gorm:"size:100;not null;uniqueIndex:uk_name_chain" json:"name"`
+	ChainID     int       `gorm:"not null;uniqueIndex:uk_name_chain" json:"chain_id"`
+	Address     string    `gorm:"size:42" json:"address"`
+	DeployBlock *uint64   `json:"deploy_block"`
+	Description string    `gorm:"type:text" json:"description"`
+	IsActive    bool      `gorm:"default:true" json:"is_active"`
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+func (SystemContract) TableName() string { return "system_contracts" }