GetEntitlement Swr Cache

Add 60s fresh / 60s stale SWR cache to getEntitlement in platform.v3.server.ts. Eliminates a synchronous billing-service HTTP round trip on every trigger. Reuses the existing platformCache (LRU memory + Redis) pattern already used for limits and usage. Cache key is ${orgId}. Errors return a permissive { hasAccess: true } fallback (existing behavior) and are also cached to prevent thundering-herd on billing outages.