feat: enhance item tooltips with binding, description, speed, and spell effects

- Parse Bonding and Description fields from SMSG_ITEM_QUERY_SINGLE_RESPONSE
  (read after the 5 spell slots: bindType uint32, then description cstring)
- Add bindType and description to ItemQueryResponseData and ItemDef
- Propagate bindType and description through all 5 rebuildOnlineInventory paths
- Tooltip now shows: "Binds when picked up/equipped/used/quest item"
- Tooltip now shows weapon damage range ("X - Y Damage") and speed ("Speed 2.60")
  on same line, plus DPS in parentheses below
- Tooltip now shows spell effects ("Use: <SpellName>", "Equip: <SpellName>",
  "Chance on Hit: ...") using existing getSpellName() lookup
- Tooltip now shows item flavor/lore description in italic-style yellow text

include/game/inventory.hpp

@@ -50,6 +50,8 @@ struct ItemDef {
     uint32_t maxDurability = 0;
     uint32_t itemLevel = 0;
     uint32_t requiredLevel = 0;
+    uint32_t bindType = 0;      // 0=none, 1=BoP, 2=BoE, 3=BoU, 4=BoQ
+    std::string description;    // Flavor/lore text shown in tooltip (italic yellow)
 };
 
 struct ItemSlot {

include/game/world_packets.hpp

@@ -1561,6 +1561,8 @@ struct ItemQueryResponseData {
         uint32_t spellTrigger = 0; // 0=Use, 1=Equip, 2=ChanceOnHit, 5=Learn
     };
     std::array<ItemSpell, 5> spells{};
+    uint32_t bindType = 0;      // 0=none, 1=BoP, 2=BoE, 3=BoU, 4=BoQ
+    std::string description;    // Flavor/lore text
     bool valid = false;
 };