feat: add set effect debug command

[HardyNLee]

介绍

新增 DebugCommand.SET_EFFECT 用于处理来自编辑器的 IEffect 字符串, 实现实时效果预览

Tip

此 PR 是 OpenWebGAL/WebGAL_Terre#495 的前置条件, 详情见那边

[gemini-code-assist]

Summary of Changes

Hello @HardyNLee, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

这个拉取请求旨在增强与编辑器的集成，通过引入一个新的调试命令，实现了舞台效果的实时预览功能。现在，编辑器可以直接发送效果配置，系统能够动态解析并更新舞台上的视觉效果，从而显著提升了开发和调试的效率与体验。

Highlights

• 新增调试命令: 引入了一个新的 DebugCommand.SET_EFFECT，允许从编辑器接收并处理 IEffect 字符串。
• 实时效果预览: 通过解析编辑器发送的 IEffect 数据，实现了舞台效果的实时预览功能，极大地提升了开发效率。
• 效果转换逻辑: 实现了智能的效果转换逻辑，能够将新的变换（包括位置和缩放）与现有效果合并，确保效果更新的平滑性和准确性。

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[gemini-code-assist]

Code Review

这个 PR 新增了 DebugCommand.SET_EFFECT 命令，用于从编辑器接收效果数据并实时更新舞台，这是一个很棒的功能。代码实现整体不错，但在处理从 WebSocket 收到的消息时，有可以改进的地方。我对 webSocketFunc.ts 中的效果处理逻辑提出了一些建议，主要是关于增加数据校验以提高代码的健壮性，以及重构变换合并的逻辑使其更清晰、更易于维护。请查看具体的代码注释。

[gemini-code-assist]

这部分代码有两点可以改进，以提高代码的健壮性和可读性：

1. 增加数据校验：JSON.parse(message.message) as IEffect 是一个类型断言，它假设了 message.message 的内容总是符合 IEffect 接口。如果收到的 JSON 字符串虽然合法但缺少 target 属性，后续代码（如 effect.target）可能会因为 undefined而出错。建议在解析后增加一个简单的校验，确保 effect 对象和它的 target 属性存在且类型正确。

2. 优化变换合并逻辑：当前合并 transform 的方式有些冗余。...(effect.transform ?? {}) 会展开 position 和 scale 属性，但它们随后又被显式地重写了。我们可以使用对象解构来分离出嵌套的 position 和 scale 对象，使代码更简洁，意图也更清晰。

我已经将这两点改进合并到了下面的代码建议中。

        const parsedEffect = JSON.parse(message.message);
        if (!parsedEffect || typeof parsedEffect.target !== 'string') {
          logger.error(`Invalid effect object received: ${message.message}`);
          return;
        }
        const effect = parsedEffect as IEffect;

        const targetEffect = webgalStore.getState().stage.effects.find((e) => e.target === effect.target);
        const targetTransform = targetEffect?.transform ?? baseTransform;

        const { position: newPosition, scale: newScale, ...restOfTransform } = effect.transform ?? {};
        const newTransform = {
          ...targetTransform,
          ...restOfTransform,
          position: {
            ...targetTransform.position,
            ...newPosition,
          },
          scale: {
            ...targetTransform.scale,
            ...newScale,
          },
        };
        webgalStore.dispatch(stageActions.updateEffect({ target: effect.target, transform: newTransform }));