v3.1.0

Minor Changes

• 064894c: Make Automatic Persisted Queries (APQ) opt-in on the server fetcher
  (initServerFetcher / initStrictServerFetcher) via a new apq option,
  defaulting to false — matching the client fetcher.

  When APQ is off (the default), operations without a documentId are sent as a
  full-query POST directly, skipping the APQ GET round-trip and the
  PersistedQueryNotFound fallback. Operations that resolve to a documentId
  (persisted/trusted documents) are always sent as a cacheable GET, regardless of
  this flag.

  This makes the server fetcher work against gateways that do not implement APQ
  (e.g. local development without a persisted-document store).

  Based on the opt-in design from #47 by @pvaneveld.