Method SoftDelete_ClaimOrphanedTask()

SQL to atomically claim an orphaned task (prevent race condition in cluster).
Updates status to 'running' and _date_modify to NOW() only if conditions still match.
CLUSTER-SAFE: Uses atomic UPDATE with condition check.
Params: $1=trashId, $2=timeoutMinutes
Returns: claimed (1 = success, 0 = task already taken by another instance)

string SoftDelete_ClaimOrphanedTask()