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/holder.go

@@ -0,0 +1,43 @@
+package models
+
+import (
+	"time"
+)
+
+// HolderSnapshot represents token holders data from blockchain
+type HolderSnapshot struct {
+	ID            uint      `gorm:"primaryKey;autoIncrement" json:"id"`
+	HolderAddress string    `gorm:"size:42;not null;index:idx_holder_token" json:"holder_address"`
+	TokenType     string    `gorm:"size:50;not null;index:idx_holder_token,idx_token_time" json:"token_type"`
+	TokenAddress  string    `gorm:"size:42;not null" json:"token_address"`
+	Balance       string    `gorm:"type:varchar(78);not null" json:"balance"`
+	ChainID       int       `gorm:"not null" json:"chain_id"`
+	FirstSeen     int64     `gorm:"not null" json:"first_seen"`
+	LastUpdated   int64     `gorm:"not null;index:idx_token_time" json:"last_updated"`
+	CreatedAt     time.Time `json:"created_at"`
+	UpdatedAt     time.Time `json:"updated_at"`
+}
+
+func (HolderSnapshot) TableName() string {
+	return "holder_snapshots"
+}
+
+// HolderStats represents aggregated statistics for each token type
+type HolderStats struct {
+	TokenType    string `json:"token_type"`
+	HolderCount  int    `json:"holder_count"`
+	TotalBalance string `json:"total_balance,omitempty"`
+}
+
+// ScannerState persists scanner progress so it can resume after restart
+type ScannerState struct {
+	ID               uint      `gorm:"primaryKey;autoIncrement"`
+	ScannerType      string    `gorm:"column:scanner_type;not null;default:'holder';uniqueIndex:idx_chain_scanner"`
+	ChainID          int       `gorm:"column:chain_id;uniqueIndex:idx_chain_scanner;not null"`
+	LastScannedBlock uint64    `gorm:"column:last_scanned_block;not null;default:0"`
+	UpdatedAt        time.Time `gorm:"column:updated_at"`
+}
+
+func (ScannerState) TableName() string {
+	return "scanner_state"
+}