mod-paragon: ignore item AllowableClass for class 12 (gear + glyphs)

Paragon is a classless concept layered on top of WotLK class data: stock items and class glyphs gate equip / vendor visibility / loot rolls / AH 'usable' filter via ItemTemplate.AllowableClass, which never has the class-12 bit (0x800). Bypassing the gate at the five enforcement sites lets Paragon equip any class-restricted item -- including class glyphs, since EffectApplyGlyph itself has no class check beyond the item gate. Race / level / proficiency / skill / required-spell checks still apply, so Paragon can't skip baseline progression.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/server/game/Entities/Player/Player.cpp

@@ -10687,7 +10687,12 @@ bool Player::BuyItemFromVendorSlot(ObjectGuid vendorguid, uint32 vendorslot, uin
         return false;
     }
 
-    if (!(pProto->AllowableClass & getClassMask()) && pProto->Bonding == BIND_WHEN_PICKED_UP && !IsGameMaster())
+    // mod-paragon: class 12 ignores BoP buy-side AllowableClass gate, so
+    // class-restricted vendor items (e.g. class glyphs) can be purchased.
+    if (getClass() != CLASS_PARAGON
+        && !(pProto->AllowableClass & getClassMask())
+        && pProto->Bonding == BIND_WHEN_PICKED_UP
+        && !IsGameMaster())
     {
         SendBuyError(BUY_ERR_CANT_FIND_ITEM, nullptr, item, 0);
         return false;