Variable TRANSACTION_ADMIN_SEARCH_CACHEConst

Shared cache config for the ADMIN transaction search projection, read by TransactionAdminService. Unlike the customer TRANSACTION_SEARCH_CACHE, admin search is cross-customer — a single result page can span many customers (or, with free-text query, none) — so entries cannot be tagged by one owning customerId. Instead every entry carries the single collection tag TRANSACTION_ADMIN_SEARCH_COLLECTION_TAG, and every transaction WRITER busts the whole collection via TransactionCacheBuster (admin has no write path of its own to self-bust).