fix: populate item subclass names for TBC expansion

The TBC item query parser left subclassName empty, so TBC items showed
no weapon/armor type in tooltips or the character sheet (e.g., "Sword",
"Plate", "Shield" were all blank). The Classic and WotLK parsers
correctly map subClass IDs to names.

Fix: call getItemSubclassName() in the TBC parser, same as WotLK.
Expose getItemSubclassName() in the header (was static, now shared
across parser files).

include/game/world_packets.hpp

@@ -698,6 +698,7 @@ public:
  * Get human-readable string for chat type
  */
 const char* getChatTypeString(ChatType type);
+const char* getItemSubclassName(uint32_t itemClass, uint32_t subClass);
 
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