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*)

include/ui/settings_panel.hpp

@@ -8,6 +8,7 @@
 
 namespace wowee {
 namespace rendering { class Renderer; }
+namespace audio { class AudioCoordinator; }
 namespace ui {
 
 class InventoryScreen;
@@ -144,8 +145,8 @@ public:
     void renderSettingsWindow(InventoryScreen& inventoryScreen, ChatPanel& chatPanel,
                               std::function<void()> saveCallback);
 
-    /// Apply audio volume levels to all renderer sound managers
-    void applyAudioVolumes(rendering::Renderer* renderer);
+    /// Apply audio volume levels to all audio coordinator sound managers
+    void applyAudioVolumes(audio::AudioCoordinator* ac);
 
     /// Return the platform-specific settings file path
     static std::string getSettingsPath();