Add comprehensive UI sound manager for interface interactions

Implemented complete UI sound system with 32+ interface sounds:

Window sounds (10 types):
- Bag open/close (backpack, containers)
- Quest log open/close
- Character sheet open/close
- Auction house open/close
- Guild bank open/close

Button sounds (2 types):
- Interface button clicks
- Main menu button clicks

Quest sounds (4 types):
- Quest activate (new quest accepted)
- Quest complete (quest turned in)
- Quest failed
- Quest update (progress notification)

Loot sounds (3 types):
- Coin pickup (small/large amounts)
- Item loot from creatures

Item sounds (6 types):
- Drop item on ground
- Pickup sounds by item type: bags, books, cloth, food, gems

Eating/Drinking (2 types):
- Eating food sound
- Drinking potion/water sound

Special sounds:
- Level up fanfare
- Error/invalid action feedback
- Target select/deselect

Technical details:
- Loads 32 sound files from Sound\Interface directory
- Volume at 0.7 with global scale control
- Simple API: playBagOpen(), playQuestComplete(), etc.
- Ready for integration with UI systems and game events
- Can be hooked to ImGui windows, inventory actions, quest system

CMakeLists.txt

@@ -106,6 +106,7 @@ set(WOWEE_SOURCES
     src/audio/mount_sound_manager.cpp
     src/audio/npc_voice_manager.cpp
     src/audio/ambient_sound_manager.cpp
+    src/audio/ui_sound_manager.cpp
 
     # Pipeline (asset loaders)
     src/pipeline/mpq_manager.cpp