refactor(gateway): share host header parsing

src/gateway/server/ws-connection/message-handler.ts

@@ -33,6 +33,7 @@ import {
 import { authorizeGatewayConnect, isLocalDirectRequest } from "../../auth.js";
 import { buildDeviceAuthPayload } from "../../device-auth.js";
 import { isLoopbackAddress, isTrustedProxyAddress, resolveGatewayClientIp } from "../../net.js";
+import { resolveHostName } from "../../net.js";
 import { resolveNodeCommandAllowlist } from "../../node-command-policy.js";
 import { checkBrowserOrigin } from "../../origin-check.js";
 import { GATEWAY_CLIENT_IDS } from "../../protocol/client-info.js";
@@ -58,11 +59,7 @@ import {
   incrementPresenceVersion,
   refreshGatewayHealthSnapshot,
 } from "../health-state.js";
-import {
-  formatGatewayAuthFailureMessage,
-  resolveHostName,
-  type AuthProvidedKind,
-} from "./auth-messages.js";
+import { formatGatewayAuthFailureMessage, type AuthProvidedKind } from "./auth-messages.js";
 
 type SubsystemLogger = ReturnType<typeof createSubsystemLogger>;