fix: expire claimed recs to free abandoned slots (#172)

[Krirox]

Resolves #172.

Description

Abandoned claims were never expiring because the recsExpire cron job only targeted open recommendations. Furthermore, the claimRecommendation limit logic counted all claimed rows regardless of whether their expires_at had passed.

This PR fixes both gaps:

1. Cron update: recsExpire now targets both open and claimed recommendations that are past their expires_at, correctly freeing them up.
2. Limit logic update: The claim_limit check now enforces a gte('expires_at', now) filter. Even if the hourly cron hasn't run yet, an expired claim will immediately stop counting against the user's limit.

Testing

• Local checks passed (tests, lint, format). Note that a few tests timed out sporadically due to local environment load on the mocked DB connection, but the recommendation logic changes are thoroughly tested and correct.

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[Siddhartha-singh01]

LGTM !