ai: archtest:allow fuer searchchatapi-a11y-fixture (wie die Schwester-Fixtures)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

ai/cmd/searchchatapi-a11y-fixture/main.go

@@ -77,5 +77,6 @@ func main() {
 	docchatapi.NewServer(chatSvc, "test-token").RegisterRoutes(mux)
 
 	log.Println("searchchatapi-mockserver listening on 127.0.0.1:19603")
+	// archtest:allow Einmaliges lokales pa11y-Testwerkzeug, kein Produktdienst
 	log.Fatal(http.ListenAndServe("127.0.0.1:19603", mux))
 }