添加代理路由和配置版本的控制器与服务，更新数据库模型，完善API路由

atsf_server/model/config_version.go

@@ -0,0 +1,31 @@
+package model
+
+import "time"
+
+type ConfigVersion struct {
+	ID             uint      `json:"id" gorm:"primaryKey"`
+	Version        string    `json:"version" gorm:"uniqueIndex;size:32;not null"`
+	SnapshotJSON   string    `json:"snapshot_json" gorm:"type:text;not null"`
+	RenderedConfig string    `json:"rendered_config" gorm:"type:text;not null"`
+	Checksum       string    `json:"checksum" gorm:"size:64;not null"`
+	IsActive       bool      `json:"is_active" gorm:"not null;default:false;index"`
+	CreatedBy      string    `json:"created_by" gorm:"size:64;not null"`
+	CreatedAt      time.Time `json:"created_at"`
+}
+
+func ListConfigVersions() (versions []*ConfigVersion, err error) {
+	err = DB.Order("id desc").Find(&versions).Error
+	return versions, err
+}
+
+func GetConfigVersionByID(id uint) (*ConfigVersion, error) {
+	version := &ConfigVersion{}
+	err := DB.First(version, id).Error
+	return version, err
+}
+
+func GetActiveConfigVersion() (*ConfigVersion, error) {
+	version := &ConfigVersion{}
+	err := DB.Where("is_active = ?", true).Order("id desc").First(version).Error
+	return version, err
+}