Optimize best-seller category SQL to prefilter products

[CySSoO]

Motivation

• Reduce database work and integration cost by avoiding expensive joins over all products when computing best-sellers for a category.
• Improve query planner efficiency by prefiltering active category products before aggregating order details.

Description

• Rewrote the best-seller-by-category SQL in src/Service/EverblockTools.php to join orders -> order_detail and then inner-join a derived subquery (filtered_products) that preselects product_shop rows joined with category_product filtered by id_shop, active, and id_category.
• Removed the direct joins to product_shop and category_product from the main query and moved their filtering into the subquery while preserving o.id_shop, o.valid, optional o.date_add filtering, grouping, ordering and limit semantics.
• Preserved the existing caching behavior (EverblockCache::cacheStore) and SQL escaping for the date condition.

Testing

• No automated tests were executed for this change.

---

Codex Task