Move the vendor mod table off the legacy item template

LOAD_TEMPLATE_MODTABLES now returns a templateID -> modTable map that
ForgeManager owns (vendorModTables). ForgeManager.forgeItem, WorkOrder
validation and the ManageNPCMsg forge item list read it through
ForgeManager.getVendorModTable(), and ItemTemplate.modTable is removed.

Values are unchanged: static_vendor_items has 5089 rows, one per
templateID, all present in static_item_templates, modTable 0-30.
Templates not in the table still read 0. The old loader stopped at the
first templateID missing from ItemTemplate.templates; there are none.
No comparator added or removed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/engine/server/world/WorldServer.java

@@ -307,8 +307,8 @@ public class WorldServer {
         Logger.info("Loading Item Templates");
         DbManager.ItemQueries.LOAD_ITEM_TEMPLATES();
 
-        Logger.info("Back fill template modTables");
-        DbManager.ItemQueries.LOAD_TEMPLATE_MODTABLES();
+        Logger.info("Loading vendor modTables");
+        ForgeManager.vendorModTables = DbManager.ItemQueries.LOAD_TEMPLATE_MODTABLES();
 
         Logger.info("Loading Deed Templates");
         DeedTemplate._deeds = DeedParser.parseDeedFolder();