chore: add favorite field to base product query

i18n/migrations/20260319163200_procedures.sql

@@ -319,7 +319,8 @@ DROP PROCEDURE IF EXISTS get_product_base //
 CREATE PROCEDURE get_product_base(
   IN p_id_product INT,
   IN p_id_shop INT,
-  IN p_id_lang INT
+  IN p_id_lang INT,
+  IN p_id_customer INT
 )
 BEGIN
     SELECT
@@ -376,14 +377,12 @@ BEGIN
         
         -- Relations
         m.name AS manufacturer,
-        cl.name AS category
+        cl.name AS category,
 
-        -- This doesn't fit to base product, I'll add proper is_favorite to product later
-
-        -- EXISTS(
-        --   SELECT 1 FROM b2b_favorites f
-        --   WHERE f.user_id = p_id_customer AND f.product_id = p_id_product
-        -- ) AS is_favorite
+        EXISTS(
+          SELECT 1 FROM b2b_favorites f
+          WHERE f.user_id = p_id_customer AND f.product_id = p_id_product
+        ) AS is_favorite