Add helper for batching creator detail fetches to reduce database round trips

[Chucks1093]

Summary
Endpoints that resolve multiple creator details in a single request currently issue one database query per creator. A batching helper that fetches multiple creator records in a single query reduces round trips and improves response time under load.

Scope

• add a helper that accepts a list of creator IDs and returns their details in a single database query
• apply the helper wherever multiple creator detail fetches are performed in a request
• add a unit test that confirms a single query is issued for multiple IDs

Acceptance Criteria

• multiple creator details are fetched in a single database query
• the helper returns results in the same order as the input IDs
• a unit test confirms the single-query behavior

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[extolkom]

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