chore(renderer): extract AnimationController and remove audio pass-throughs

Extract ~1,500 lines of character animation state from Renderer into a dedicated
AnimationController class, and complete the AudioCoordinator migration by removing
all 10 audio pass-through getters from Renderer.

AnimationController:
- New: include/rendering/animation_controller.hpp (182 lines)
- New: src/rendering/animation_controller.cpp (1,703 lines)
- Moves: locomotion state machine (50+ members), mount animation (40+ members),
  emote system, footstep triggering, surface detection, melee combat animations
- Renderer holds std::unique_ptr<AnimationController> and delegates completely
- AnimationController accesses audio via renderer_->getAudioCoordinator()

Audio caller migration:
- Migrate ~60 external callers from renderer->getXManager() to AudioCoordinator
  directly, grouped by access pattern:
  - UIServices: settings_panel, game_screen, toast_manager, chat_panel,
    combat_ui, window_manager
  - GameServices: game_handler, spell_handler, inventory_handler, quest_handler,
    social_handler, combat_handler
  - Application singleton: application.cpp, auth_screen.cpp, lua_engine.cpp
- Remove 10 pass-through getter definitions from renderer.cpp
- Remove 10 pass-through getter declarations from renderer.hpp
- Remove individual audio manager forward declarations from renderer.hpp
- Redirect 69 internal renderer.cpp audio calls to audioCoordinator_ directly
- game_handler.cpp: withSoundManager template uses services_.audioCoordinator;
  MFP changed from &Renderer::getUiSoundManager to &AudioCoordinator::getUiSoundManager
- GameServices struct: add AudioCoordinator* audioCoordinator member
- settings_panel: applyAudioVolumes(Renderer*) -> applyAudioVolumes(AudioCoordinator*)

src/ui/toast_manager.cpp

@@ -2,6 +2,7 @@
 #include "game/game_handler.hpp"
 #include "core/application.hpp"
 #include "rendering/renderer.hpp"
+#include "audio/audio_coordinator.hpp"
 #include "audio/ui_sound_manager.hpp"
 
 #include <imgui.h>
@@ -461,11 +462,13 @@ void ToastManager::triggerDing(uint32_t newLevel, uint32_t hpDelta, uint32_t man
     dingStats_[3]  = intel;
     dingStats_[4]  = spi;
 
-    auto* renderer = services_.renderer;
-    if (renderer) {
-        if (auto* sfx = renderer->getUiSoundManager()) {
+    auto* ac = services_.audioCoordinator;
+    if (ac) {
+        if (auto* sfx = ac->getUiSoundManager()) {
             sfx->playLevelUp();
         }
+    }
+    if (auto* renderer = services_.renderer) {
         renderer->playEmote("cheer");
     }
 }
@@ -550,9 +553,9 @@ void ToastManager::triggerAchievementToast(uint32_t achievementId, std::string n
     achievementToastTimer_ = ACHIEVEMENT_TOAST_DURATION;
 
     // Play a UI sound if available
-    auto* renderer = services_.renderer;
-    if (renderer) {
-        if (auto* sfx = renderer->getUiSoundManager()) {
+    auto* ac = services_.audioCoordinator;
+    if (ac) {
+        if (auto* sfx = ac->getUiSoundManager()) {
             sfx->playAchievementAlert();
         }
     }