fix: improve error message for invalid input in lookup functionality

Updated the error response for invalid input in the handleLookup function to provide a clearer message indicating that the query must be an IP address or FQDN, enhancing user understanding of the input requirements.

internal/httpapi/routes_lookup.go

@@ -27,7 +27,7 @@ func (s *Server) handleLookup(w http.ResponseWriter, r *http.Request) {
 	res, err := lookup.Lookup(s.store, a.TenantID, q)
 	if err != nil {
 		if errors.Is(err, store.ErrInvalidInput) {
-			writeProblem(w, http.StatusBadRequest, "Bad Request", err.Error())
+			writeProblem(w, http.StatusBadRequest, "Bad Request", "query must be an IP address or FQDN")
 			return
 		}
 		writeStoreErr(w, err)