feat: 实现游戏摄像机控制器并优化地图系统

重构地图系统，增加摄像机控制器管理相机行为。主要变更包括：
- 新增 GameCameraController 类，支持跟随目标和调试模式
- 重构 GameMap 类，分离相机逻辑到控制器
- 优化地图资源加载和同步逻辑
- 改进动画系统的事件处理
- 添加地图测试场景用于快速验证

modules/build_helpers/assets.lua

@@ -0,0 +1,49 @@
+function syncAssets(source_dir, target_dir)
+    if not os.isdir(source_dir) then
+        return
+    end
+
+    local copied = 0
+    local skipped = 0
+    local removed = 0
+    local source_files = {}
+
+    for _, source_file in ipairs(os.files(path.join(source_dir, "**"))) do
+        local relative_path = path.relative(source_file, source_dir)
+        local target_file = path.join(target_dir, relative_path)
+        local target_subdir = path.directory(target_file)
+        local should_copy = not os.isfile(target_file)
+
+        source_files[relative_path] = true
+
+        if not should_copy then
+            local source_mtime = os.mtime(source_file)
+            local target_mtime = os.mtime(target_file)
+            local source_size = os.filesize(source_file)
+            local target_size = os.filesize(target_file)
+            should_copy = source_mtime > target_mtime or source_size ~= target_size
+        end
+
+        if should_copy then
+            if target_subdir ~= "." and not os.isdir(target_subdir) then
+                os.mkdir(target_subdir)
+            end
+            os.cp(source_file, target_file)
+            copied = copied + 1
+        else
+            skipped = skipped + 1
+        end
+    end
+
+    if os.isdir(target_dir) then
+        for _, target_file in ipairs(os.files(path.join(target_dir, "**"))) do
+            local relative_path = path.relative(target_file, target_dir)
+            if not source_files[relative_path] then
+                os.rm(target_file)
+                removed = removed + 1
+            end
+        end
+    end
+
+    print(string.format("Sync assets: %d copied, %d skipped, %d removed", copied, skipped, removed))
+end