Implement NPC greeting voice lines

Added NPC voice manager that plays greeting sounds when clicking on NPCs:

Features:
- Voice line library with multiple race/gender voice types (Human, Dwarf,
  Night Elf, etc.)
- 3D positional audio - voice comes from NPC location
- Cooldown system prevents spam clicking same NPC
- Randomized pitch/volume for variety
- Loads greeting sounds from character voice files in MPQ
- Generic fallback voices for NPCs without specific voice types

Voice lines trigger automatically when gossip window opens (SMSG_GOSSIP_MESSAGE).
Uses same audio system as other sound effects with ma_sound_set_position.

CMakeLists.txt

@@ -104,6 +104,7 @@ set(WOWEE_SOURCES
     src/audio/footstep_manager.cpp
     src/audio/activity_sound_manager.cpp
     src/audio/mount_sound_manager.cpp
+    src/audio/npc_voice_manager.cpp
 
     # Pipeline (asset loaders)
     src/pipeline/mpq_manager.cpp

include/audio/npc_voice_manager.hpp

@@ -6,6 +6,7 @@
 #include <cstdint>
 #include <random>
 #include <chrono>
+#include <glm/glm.hpp>
 
 namespace wowee {
 namespace pipeline { class AssetManager; }

include/game/game_handler.hpp

@@ -357,6 +357,10 @@ public:
     using NpcSwingCallback = std::function<void(uint64_t guid)>;
     void setNpcSwingCallback(NpcSwingCallback cb) { npcSwingCallback_ = std::move(cb); }
 
+    // NPC greeting callback (plays voice line when NPC is clicked)
+    using NpcGreetingCallback = std::function<void(uint64_t guid, const glm::vec3& position)>;
+    void setNpcGreetingCallback(NpcGreetingCallback cb) { npcGreetingCallback_ = std::move(cb); }
+
     // XP tracking
     uint32_t getPlayerXp() const { return playerXp_; }
     uint32_t getPlayerNextLevelXp() const { return playerNextLevelXp_; }
@@ -1030,6 +1034,7 @@ private:
     NpcRespawnCallback npcRespawnCallback_;
     MeleeSwingCallback meleeSwingCallback_;
     NpcSwingCallback npcSwingCallback_;
+    NpcGreetingCallback npcGreetingCallback_;
     MountCallback mountCallback_;
     TaxiPrecacheCallback taxiPrecacheCallback_;
     TaxiOrientationCallback taxiOrientationCallback_;

include/rendering/renderer.hpp

@@ -8,7 +8,7 @@
 namespace wowee {
 namespace core { class Window; }
 namespace game { class World; class ZoneManager; }
-namespace audio { class MusicManager; class FootstepManager; class ActivitySoundManager; class MountSoundManager; enum class FootstepSurface : uint8_t; }
+namespace audio { class MusicManager; class FootstepManager; class ActivitySoundManager; class MountSoundManager; class NpcVoiceManager; enum class FootstepSurface : uint8_t; enum class VoiceType; }
 namespace pipeline { class AssetManager; }
 
 namespace rendering {
@@ -149,6 +149,7 @@ public:
     audio::FootstepManager* getFootstepManager() { return footstepManager.get(); }
     audio::ActivitySoundManager* getActivitySoundManager() { return activitySoundManager.get(); }
     audio::MountSoundManager* getMountSoundManager() { return mountSoundManager.get(); }
+    audio::NpcVoiceManager* getNpcVoiceManager() { return npcVoiceManager.get(); }
 
 private:
     core::Window* window = nullptr;
@@ -175,6 +176,7 @@ private:
     std::unique_ptr<audio::FootstepManager> footstepManager;
     std::unique_ptr<audio::ActivitySoundManager> activitySoundManager;
     std::unique_ptr<audio::MountSoundManager> mountSoundManager;
+    std::unique_ptr<audio::NpcVoiceManager> npcVoiceManager;
     std::unique_ptr<game::ZoneManager> zoneManager;
     std::unique_ptr<Shader> underwaterOverlayShader;
     uint32_t underwaterOverlayVAO = 0;

src/core/application.cpp

@@ -6,6 +6,7 @@
 #include "core/logger.hpp"
 #include "core/memory_monitor.hpp"
 #include "rendering/renderer.hpp"
+#include "audio/npc_voice_manager.hpp"
 #include "rendering/camera.hpp"
 #include "rendering/camera_controller.hpp"
 #include "rendering/terrain_renderer.hpp"
@@ -814,6 +815,15 @@ void Application::setupUICallbacks() {
         }
     });
 
+    // NPC greeting callback - play voice line
+    gameHandler->setNpcGreetingCallback([this](uint64_t guid, const glm::vec3& position) {
+        if (renderer && renderer->getNpcVoiceManager()) {
+            // Convert canonical to render coords for 3D audio
+            glm::vec3 renderPos = core::coords::canonicalToRender(position);
+            renderer->getNpcVoiceManager()->playGreeting(guid, audio::VoiceType::GENERIC, renderPos);
+        }
+    });
+
     // "Create Character" button on character screen
     uiManager->getCharacterScreen().setOnCreateCharacter([this]() {
         uiManager->getCharacterCreateScreen().reset();

src/game/game_handler.cpp

@@ -4569,6 +4569,15 @@ void GameHandler::handleGossipMessage(network::Packet& packet) {
     if (questDetailsOpen) return; // Don't reopen gossip while viewing quest
     gossipWindowOpen = true;
     vendorWindowOpen = false; // Close vendor if gossip opens
+
+    // Play NPC greeting voice
+    if (npcGreetingCallback_ && currentGossip.npcGuid != 0) {
+        auto entity = entityManager.getEntity(currentGossip.npcGuid);
+        if (entity) {
+            glm::vec3 npcPos(entity->getX(), entity->getY(), entity->getZ());
+            npcGreetingCallback_(currentGossip.npcGuid, npcPos);
+        }
+    }
 }
 
 void GameHandler::handleGossipComplete(network::Packet& packet) {

src/rendering/renderer.cpp

@@ -37,6 +37,7 @@
 #include "audio/footstep_manager.hpp"
 #include "audio/activity_sound_manager.hpp"
 #include "audio/mount_sound_manager.hpp"
+#include "audio/npc_voice_manager.hpp"
 #include <GL/glew.h>
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtx/euler_angles.hpp>
@@ -342,6 +343,7 @@ bool Renderer::initialize(core::Window* win) {
     footstepManager = std::make_unique<audio::FootstepManager>();
     activitySoundManager = std::make_unique<audio::ActivitySoundManager>();
     mountSoundManager = std::make_unique<audio::MountSoundManager>();
+    npcVoiceManager = std::make_unique<audio::NpcVoiceManager>();
 
     // Underwater full-screen tint overlay (applies to all world geometry).
     underwaterOverlayShader = std::make_unique<Shader>();
@@ -2132,6 +2134,12 @@ bool Renderer::loadTerrainArea(const std::string& mapName, int centerX, int cent
             activitySoundManager->initialize(cachedAssetManager);
         }
     }
+    if (mountSoundManager && cachedAssetManager) {
+        mountSoundManager->initialize(cachedAssetManager);
+    }
+    if (npcVoiceManager && cachedAssetManager) {
+        npcVoiceManager->initialize(cachedAssetManager);
+    }
 
     // Wire WMO, M2, and water renderer to camera controller
     if (cameraController && wmoRenderer) {