Unleash / unleash / 26627240724

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feat: add flightRecorder experimental flag (#12135)

## What

- Add `flightRecorder` to `IFlagKey` and the experimental `flags` object
in `src/lib/types/experimental.ts` (default `false`, controlled by
`UNLEASH_EXPERIMENTAL_FLIGHT_RECORDER`).
- Export the existing `requireFeatureEnabled` route-gate middleware from
the package root (`server-impl.ts`).

## Why

The enterprise build mounts a flight-recorder ingestion router. Gating
it needs the flag to exist in OSS (the flag type is the source of
truth), and it should be enforced **per request** so the feature can be
killed at runtime, not only at startup. Exporting
`requireFeatureEnabled` lets downstream consumers wrap a router with a
flag check that returns `404` when the flag is off.

Both pieces are additive and default-off; no behavior changes for
existing flags or routes.

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