fix(deja): don't pin redis backend in the deja feature + fix spell typo
The router `deja` feature listed `redis-rs`, forcing the redis-rs backend
on even when `fred` was selected — so the `just clippy fred` CI pass
compiled BOTH backends and hit duplicate `impl RedisValue` definitions
(redis_interface fred vs redis-rs). The backend is chosen independently
(default/release), so the `deja` feature must not pin it.
Also fix a `featrue` -> `feature` typo in the stripebilling connector
comment, surfaced by the spell-check over the main merge into this branch.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>