feat: 添加游戏核心模块，包括地图、角色、场景和世界管理

实现游戏基础架构，包含以下主要功能：
- 地图系统：支持地图加载、图层管理和相机控制
- 角色系统：实现角色装备、动画和行为管理
- 场景系统：提供测试场景和世界场景切换
- 世界管理：处理城镇和区域切换逻辑
- 数据加载：添加角色和装备配置加载器

这些改动为游戏开发奠定了基础框架，支持后续功能扩展

Game/src/world/GameTown.cpp

@@ -0,0 +1,117 @@
+#include "world/GameTown.h"
+#include <SDL2/SDL.h>
+#include <algorithm>
+
+namespace frostbite2D {
+
+GameTown::GameTown() = default;
+
+bool GameTown::Init(int index, const std::string& townPath) {
+  game::TownConfig config;
+  if (!game::loadTownConfig(townPath, config)) {
+    SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "GameTown: failed to init town %d (%s)",
+                 index, townPath.c_str());
+    return false;
+  }
+
+  name_ = config.townName;
+  enteringTitle_ = config.enteringTitle;
+  enteringCutscene_ = config.enteringCutscene;
+  needQuestId_ = config.needQuestId;
+  needLevel_ = config.needLevel;
+  mapList_.clear();
+  curMapIndex_ = -1;
+  sariaRoomId_ = -1;
+  sariaRoomPos_ = Vec2(-1.0f, -1.0f);
+
+  for (const auto& [areaId, areaConfig] : config.areas) {
+    auto map = MakePtr<GameMap>();
+    if (!map->LoadMap(areaConfig.mapPath)) {
+      continue;
+    }
+
+    MapInfo info;
+    info.areaId = areaId;
+    info.map = map;
+    info.type = areaConfig.mapType;
+    info.generatePos = areaConfig.generatePos;
+    mapList_.push_back(info);
+
+    if (info.type == "gate") {
+      sariaRoomId_ = areaId;
+      sariaRoomPos_ = areaConfig.generatePos;
+    }
+  }
+
+  std::sort(mapList_.begin(), mapList_.end(),
+            [](const MapInfo& a, const MapInfo& b) { return a.areaId < b.areaId; });
+  return !mapList_.empty();
+}
+
+RefPtr<GameMap> GameTown::GetArea(int index) const {
+  auto it = std::find_if(mapList_.begin(), mapList_.end(),
+                         [index](const MapInfo& info) { return info.areaId == index; });
+  if (it == mapList_.end()) {
+    return nullptr;
+  }
+  return it->map;
+}
+
+void GameTown::AddCharacter(RefPtr<Actor> actor, int areaIndex) {
+  int targetMapIndex = areaIndex;
+  if (areaIndex == -2) {
+    targetMapIndex = sariaRoomId_ != -1 ? sariaRoomId_ : (mapList_.empty() ? -1 : mapList_.front().areaId);
+  }
+
+  auto mapIt = std::find_if(mapList_.begin(), mapList_.end(),
+                            [targetMapIndex](const MapInfo& info) {
+                              return info.areaId == targetMapIndex;
+                            });
+  if (mapIt == mapList_.end()) {
+    SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+                "GameTown: target area %d not found, fallback to first map", targetMapIndex);
+    if (mapList_.empty()) {
+      return;
+    }
+    mapIt = mapList_.begin();
+  }
+
+  if (curMapIndex_ != -1) {
+    auto oldMap = GetArea(curMapIndex_);
+    if (oldMap) {
+      RemoveChild(oldMap);
+    }
+  }
+
+  if (actor && actor->GetParent()) {
+    actor->GetParent()->RemoveChild(actor);
+  }
+
+  AddChild(mapIt->map);
+  cameraController_.SetMap(mapIt->map.Get());
+  cameraController_.SetZoom(1.2f);
+  cameraController_.SetTarget(actor.Get());
+  cameraController_.SnapToDefaultFocus();
+
+  if (actor) {
+    cameraController_.SetDebugEnabled(false);
+    if (areaIndex == -2 && sariaRoomPos_.x >= 0.0f && sariaRoomPos_.y >= 0.0f) {
+      actor->SetPosition(sariaRoomPos_);
+    }
+    mapIt->map->AddObject(actor);
+    cameraController_.SetFocus(actor->GetPosition());
+  } else {
+    cameraController_.SetDebugEnabled(true);
+  }
+
+  mapIt->map->Enter();
+
+  curMapIndex_ = mapIt->areaId;
+}
+
+void GameTown::Update(float deltaTime) {
+  Actor::Update(deltaTime);
+  cameraController_.Update(deltaTime);
+}
+
+} // namespace frostbite2D