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/chat_panel.cpp

@@ -11,6 +11,7 @@
 #include "rendering/renderer.hpp"
 #include "rendering/camera.hpp"
 #include "rendering/camera_controller.hpp"
+#include "audio/audio_coordinator.hpp"
 #include "audio/audio_engine.hpp"
 #include "audio/ui_sound_manager.hpp"
 #include "pipeline/asset_manager.hpp"
@@ -1109,8 +1110,8 @@ void ChatPanel::render(game::GameHandler& gameHandler,
             std::string bodyLower = mMsg.message;
             for (auto& c : bodyLower) c = static_cast<char>(std::tolower(static_cast<unsigned char>(c)));
             if (bodyLower.find(selfNameLower) != std::string::npos) {
-                if (auto* renderer = services_.renderer) {
-                    if (auto* ui = renderer->getUiSoundManager())
+                if (auto* ac = services_.audioCoordinator) {
+                    if (auto* ui = ac->getUiSoundManager())
                         ui->playWhisperReceived();
                 }
                 break; // play at most once per scan pass