feat: parse and display item level and required level in tooltips

- Add itemLevel/requiredLevel fields to ItemQueryResponseData (parsed
  from SMSG_ITEM_QUERY_SINGLE_RESPONSE) and ItemDef
- Propagate through all 5 rebuildOnlineInventory() paths
- Show "Item Level N" and "Requires Level N" in item tooltip in
  standard WoW order (below item name, above required level/stats)

include/game/inventory.hpp

@@ -48,6 +48,8 @@ struct ItemDef {
     uint32_t sellPrice = 0;
     uint32_t curDurability = 0;
     uint32_t maxDurability = 0;
+    uint32_t itemLevel = 0;
+    uint32_t requiredLevel = 0;
 };
 
 struct ItemSlot {

include/game/world_packets.hpp

@@ -1552,6 +1552,8 @@ struct ItemQueryResponseData {
     int32_t intellect = 0;
     int32_t spirit = 0;
     uint32_t sellPrice = 0;
+    uint32_t itemLevel = 0;
+    uint32_t requiredLevel = 0;
     std::string subclassName;
     // Item spells (up to 5)
     struct ItemSpell {

src/game/game_handler.cpp

@@ -10758,6 +10758,8 @@ void GameHandler::rebuildOnlineInventory() {
             def.agility = infoIt->second.agility;
             def.intellect = infoIt->second.intellect;
             def.spirit = infoIt->second.spirit;
+            def.itemLevel = infoIt->second.itemLevel;
+            def.requiredLevel = infoIt->second.requiredLevel;
         } else {
             def.name = "Item " + std::to_string(def.itemId);
             queryItemInfo(def.itemId, guid);
@@ -10798,6 +10800,8 @@ void GameHandler::rebuildOnlineInventory() {
             def.agility = infoIt->second.agility;
             def.intellect = infoIt->second.intellect;
             def.spirit = infoIt->second.spirit;
+            def.itemLevel = infoIt->second.itemLevel;
+            def.requiredLevel = infoIt->second.requiredLevel;
         } else {
             def.name = "Item " + std::to_string(def.itemId);
             queryItemInfo(def.itemId, guid);
@@ -10873,6 +10877,8 @@ void GameHandler::rebuildOnlineInventory() {
                 def.agility = infoIt->second.agility;
                 def.intellect = infoIt->second.intellect;
                 def.spirit = infoIt->second.spirit;
+                def.itemLevel = infoIt->second.itemLevel;
+                def.requiredLevel = infoIt->second.requiredLevel;
                 def.bagSlots = infoIt->second.containerSlots;
             } else {
                 def.name = "Item " + std::to_string(def.itemId);
@@ -10915,6 +10921,8 @@ void GameHandler::rebuildOnlineInventory() {
             def.agility = infoIt->second.agility;
             def.intellect = infoIt->second.intellect;
             def.spirit = infoIt->second.spirit;
+            def.itemLevel = infoIt->second.itemLevel;
+            def.requiredLevel = infoIt->second.requiredLevel;
             def.sellPrice = infoIt->second.sellPrice;
             def.bagSlots = infoIt->second.containerSlots;
         } else {
@@ -10998,6 +11006,8 @@ void GameHandler::rebuildOnlineInventory() {
                 def.agility = infoIt->second.agility;
                 def.intellect = infoIt->second.intellect;
                 def.spirit = infoIt->second.spirit;
+                def.itemLevel = infoIt->second.itemLevel;
+                def.requiredLevel = infoIt->second.requiredLevel;
                 def.sellPrice = infoIt->second.sellPrice;
                 def.bagSlots = infoIt->second.containerSlots;
             } else {

src/game/world_packets.cpp

@@ -2449,8 +2449,8 @@ bool ItemQueryResponseParser::parse(network::Packet& packet, ItemQueryResponseDa
 
     packet.readUInt32(); // AllowableClass
     packet.readUInt32(); // AllowableRace
-    packet.readUInt32(); // ItemLevel
+    data.itemLevel = packet.readUInt32();
-    packet.readUInt32(); // RequiredLevel
+    data.requiredLevel = packet.readUInt32();
     packet.readUInt32(); // RequiredSkill
     packet.readUInt32(); // RequiredSkillRank
     packet.readUInt32(); // RequiredSpell

src/ui/inventory_screen.cpp

@@ -1714,6 +1714,9 @@ void InventoryScreen::renderItemTooltip(const game::ItemDef& item, const game::I
 
     ImVec4 qColor = getQualityColor(item.quality);
     ImGui::TextColored(qColor, "%s", item.name.c_str());
+    if (item.itemLevel > 0) {
+        ImGui::TextColored(ImVec4(1.0f, 1.0f, 1.0f, 0.7f), "Item Level %u", item.itemLevel);
+    }
 
     if (item.itemId == 6948 && gameHandler_) {
         uint32_t mapId = 0;
@@ -1819,6 +1822,9 @@ void InventoryScreen::renderItemTooltip(const game::ItemDef& item, const game::I
     if (!bonusLine.empty()) {
         ImGui::TextColored(green, "%s", bonusLine.c_str());
     }
+    if (item.requiredLevel > 1) {
+        ImGui::TextColored(ImVec4(1.0f, 0.5f, 0.5f, 1.0f), "Requires Level %u", item.requiredLevel);
+    }
     if (item.maxDurability > 0) {
         float durPct = static_cast<float>(item.curDurability) / static_cast<float>(item.maxDurability);
         ImVec4 durColor;