refactor(db): use version string as primary key for ConfigVersion

-transition `of_config_versions` primary key from `id` to `version` string.
-add database migration files `202606270001_make_version_primary_key.sql` for PostgreSQL and SQLite.
-introduce AfterFind/AfterCreate GORM hooks to preserve JSON backward compatibility.
-refactor API controllers, logics, and front-end typescript definitions to receive `string` parameter.

internal/apps/openflare/agent/waf_ip_group.go

@@ -129,7 +129,7 @@ func checksumAgentWAFIPGroup(group WAFIPGroup) string {
 }
 
 func activeConfigWAFIPGroupIDs(ctx context.Context) ([]uint, error) {
-	version, err := loadActiveConfigVersion(ctx)
+	version, err := model.GetActiveConfigVersion(ctx)
 	if err != nil {
 		if isActiveConfigNotFound(err) {
 			return []uint{}, nil