Function registerBuiltinRateLimiters

Registers the built-in in-memory RateLimiter. The "redis" backend was relocated to @o3co/auth-provider-redis in Phase 10; consumers wire it via:

import { redisRateLimiterBuilder } from "@o3co/auth-provider-redis"; factory.register("redis", redisRateLimiterBuilder);

Or use the declarative redisRateLimiterModule in their modules array.