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/auth_screen.cpp

@@ -6,6 +6,7 @@
 #include "rendering/renderer.hpp"
 #include "rendering/vk_context.hpp"
 #include "pipeline/asset_manager.hpp"
+#include "audio/audio_coordinator.hpp"
 #include "audio/music_manager.hpp"
 #include "game/expansion_profile.hpp"
 #include <imgui.h>
@@ -199,20 +200,20 @@ void AuthScreen::render(auth::AuthHandler& authHandler) {
     }
 
     auto& app = core::Application::getInstance();
-    auto* renderer = app.getRenderer();
+    auto* ac = app.getAudioCoordinator();
     if (!musicInitAttempted) {
         musicInitAttempted = true;
         auto* assets = app.getAssetManager();
-        if (renderer) {
-            auto* music = renderer->getMusicManager();
+        if (ac) {
+            auto* music = ac->getMusicManager();
             if (music && assets && assets->isInitialized() && !music->isInitialized()) {
                 music->initialize(assets);
             }
         }
     }
     // Login screen music
-    if (renderer) {
-        auto* music = renderer->getMusicManager();
+    if (ac) {
+        auto* music = ac->getMusicManager();
         if (music) {
             if (!loginMusicVolumeAdjusted_) {
                 savedMusicVolume_ = music->getVolume();
@@ -506,9 +507,9 @@ void AuthScreen::render(auth::AuthHandler& authHandler) {
 
 void AuthScreen::stopLoginMusic() {
     auto& app = core::Application::getInstance();
-    auto* renderer = app.getRenderer();
-    if (!renderer) return;
-    auto* music = renderer->getMusicManager();
+    auto* ac = app.getAudioCoordinator();
+    if (!ac) return;
+    auto* music = ac->getMusicManager();
     if (!music) return;
     if (musicPlaying) {
         music->stopMusic(500.0f);