platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/transport_singbox_dns_migration.go

@@ -0,0 +1,25 @@
+package app
+
+import "strings"
+
+func transportSingBoxDNSMigrationEnabled(client TransportClient) bool {
+	if transportConfigHasKey(client.Config, "singbox_dns_migrate_legacy") {
+		return transportConfigBool(client.Config, "singbox_dns_migrate_legacy")
+	}
+	return client.Kind == TransportClientSingBox
+}
+
+func transportSingBoxDNSMigrationStrict(client TransportClient) bool {
+	return transportConfigBool(client.Config, "singbox_dns_migrate_strict")
+}
+
+func transportSingBoxConfigPath(client TransportClient) string {
+	configPath := strings.TrimSpace(transportConfigString(client.Config, "singbox_config_path"))
+	if configPath == "" {
+		configPath = strings.TrimSpace(transportConfigString(client.Config, "config_path"))
+	}
+	if configPath == "" {
+		configPath = defaultTransportConfigPath(client.ID, "singbox.json")
+	}
+	return strings.TrimSpace(configPath)
+}