Local evaluation silently drops identity overrides on large environments

Server-side SDKs cache the environment document for local evaluation, but the Ruby client today only ingests the first response page. For environments large enough to span multiple pages — typically those with many identity overrides — every override beyond the first page is missing from the local cache. Affected identities are evaluated against an incomplete environment and may receive flags that disagree with remote evaluation, with no error surfaced to the operator.

## Acceptance criteria

- Local evaluation returns the same identity-override results as remote evaluation regardless of how large the environment is.
- Existing users on environments small enough to fit a single page see no behaviour or configuration change.
- When fetching a full environment takes longer than the configured refresh interval, the SDK logs a warning naming both durations, so the operator knows to raise the interval or trim the environment.

Parent: Flagsmith/flagsmith#4664
Reference implementation: Flagsmith/flagsmith-nodejs-client#205

Inizia individuando il recupero dell’ambiente di local-evaluation del client Ruby e confronta il suo comportamento di paginazione con l’implementazione di riferimento di Flagsmith Node.js menzionata nell’issue. Verifica i risultati locali e remoti di identity-override negli ambienti con più pagine, mantieni il comportamento per una singola pagina e conferma che gli aggiornamenti lenti registrino entrambe le durate come descritto nei criteri di accettazione.

Scritto dal modello di indicizzazione a partire dal testo della issue.