feat(traefik): add support for internationalized domain names (IDN)

- Implemented a function to convert IDNs to ASCII punycode format, ensuring compatibility with Traefik requirements.
- Added tests to verify the conversion of IDNs and the handling of ASCII domains in router configurations.

packages/server/src/utils/traefik/domain.ts

@@ -104,6 +104,20 @@ export const removeDomain = async (
 	}
 };
 
+/**
+ * Converts an internationalized domain name (IDN) to ASCII punycode format.
+ * Traefik requires domain names in ASCII format, so non-ASCII characters
+ * must be converted (e.g., "тест.рф" → "xn--e1aybc.xn--p1ai").
+ */
+const toPunycode = (host: string): string => {
+	try {
+		return new URL(`http://${host}`).hostname;
+	} catch {
+		// If URL parsing fails, return the original host
+		return host;
+	}
+};
+
 export const createRouterConfig = async (
 	app: ApplicationNested,
 	domain: Domain,
@@ -114,8 +128,9 @@ export const createRouterConfig = async (
 
 	const { host, path, https, uniqueConfigKey, internalPath, stripPath } =
 		domain;
+	const punycodeHost = toPunycode(host);
 	const routerConfig: HttpRouter = {
-		rule: `Host(\`${host}\`)${path !== null && path !== "/" ? ` && PathPrefix(\`${path}\`)` : ""}`,
+		rule: `Host(\`${punycodeHost}\`)${path !== null && path !== "/" ? ` && PathPrefix(\`${path}\`)` : ""}`,
 		service: `${appName}-service-${uniqueConfigKey}`,
 		middlewares: [],
 		entryPoints: [entryPoint],