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'

include/game/world_packets.hpp

@@ -1619,6 +1619,13 @@ struct ItemQueryResponseData {
     std::array<uint32_t, 3> socketColor{};
     uint32_t socketBonus = 0;   // enchantmentId of socket bonus; 0=none
     uint32_t itemSetId   = 0;   // ItemSet.dbc entry; 0=not part of a set
+    // Requirement fields
+    uint32_t requiredSkill = 0;       // SkillLine.dbc ID (0 = no skill required)
+    uint32_t requiredSkillRank = 0;   // Minimum skill value
+    uint32_t allowableClass = 0;      // Class bitmask (0 = all classes)
+    uint32_t allowableRace  = 0;      // Race bitmask (0 = all races)
+    uint32_t requiredReputationFaction = 0;  // Faction.dbc ID (0 = none)
+    uint32_t requiredReputationRank    = 0;  // 0=Hated..8=Exalted
     bool valid = false;
 };