feat: parse and display item skill/reputation requirements in tooltips

- Store requiredSkill, requiredSkillRank, allowableClass, allowableRace,
  requiredReputationFaction, and requiredReputationRank from
  SMSG_ITEM_QUERY_SINGLE_RESPONSE in ItemQueryResponseData (was discarded)
- Show "Requires <Skill> (<rank>)" in item tooltip, highlighted red when
  the player doesn't have sufficient skill level
- Show "Requires <Rank> with <Faction>" for reputation-gated items
- Skill names resolved from SkillLine.dbc; faction names from Faction.dbc
- Also fix loot window tooltip suppressing items with names starting with 'I'

src/ui/game_screen.cpp

@@ -12462,8 +12462,9 @@ void GameScreen::renderLootWindow(game::GameHandler& gameHandler) {
             // Show item tooltip on hover
             if (hovered && info && info->valid) {
                 inventoryScreen.renderItemTooltip(*info);
-            } else if (hovered && !itemName.empty() && itemName[0] != 'I') {
-                ImGui::SetTooltip("%s", itemName.c_str());
+            } else if (hovered && info && !info->name.empty()) {
+                // Item info received but not yet fully valid — show name at minimum
+                ImGui::SetTooltip("%s", info->name.c_str());
             }
 
             ImDrawList* drawList = ImGui::GetWindowDrawList();