[frontend]增加前端对话界面插件化功能

[wjn1584]

🔗 相关问题 / Related Issue

Issue 链接 / Issue Link: #

• 我已经创建了相关 Issue 并进行了讨论 / I have created and discussed the related issue
• 这是一个微小的修改（如错别字），不需要 Issue / This is a trivial change (like typo fix) that doesn't need an issue

📋 变更类型 / Type of Change

请删除不适用的选项 / Please delete options that are not relevant

• 🐛 Bug 修复 / Bug fix (non-breaking change which fixes an issue)
• ✨ 新功能 / New feature (non-breaking change which adds functionality)
• 💥 破坏性变更 / Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 文档更新 / Documentation update
• 🔧 重构 / Refactoring (no functional changes)
• ⚡ 性能优化 / Performance improvement
• 🧹 代码清理 / Code cleanup

📝 变更目的 / Purpose of the Change

前端支持加载自定义开发的对话界面插件。
The front-end supports loading custom developed conversational interface plugins.

📋 主要变更 / Brief Changelog

• 增加加载自定义开发的对话界面插件机制
• 开始节点增加选择对话界面插件入口
• 打包脚本增加构建启动对话界面插件内容
• Added a mechanism to load custom developed dialogue interface plug-in
• Added an entry to select dialogue interface plug-in in the start node
• Added the content of building and starting dialogue interface plug-in in the packaging script

🧪 验证变更 / Verifying this Change

测试步骤 / Test Steps

1. 将插件代码下载到plugins目录下，修改plugins/manifest.json,添加插件配置信息
2. 执行npm install --force；npm start:single
3. 可以在开始节点选择使用什么对话界面插件，切换对话插件
4. 返回应用对话界面，对话界面已切换
5. Download the plugin code to the plugins directory, modify plugins/manifest.json, and add plugin configuration information
6. Execute npm install --force; npm start:single
7. You can choose which dialogue interface plugin to use at the start node and switch the dialogue plugin
8. Return to the application dialogue interface, the dialogue interface has been switched

测试覆盖 / Test Coverage

• 我已经添加了单元测试 / I have added unit tests
• 所有现有测试都通过 / All existing tests pass
• 我已经进行了手动测试 / I have performed manual testing

📸 截图 / Screenshots

✅ 贡献者检查清单 / Contributor Checklist

请确保你的 Pull Request 符合以下要求 / Please ensure your Pull Request meets the following requirements:

基本要求 / Basic Requirements:

• 确保有 GitHub Issue 对应这个变更（微小变更如错别字除外）/ Make sure there is a Github issue filed for the change (trivial changes like typos excluded)
• 你的 Pull Request 只解决一个 Issue，没有包含其他不相关的变更 / Your PR addresses just this issue, without pulling in other changes - one PR resolves one issue
• PR 中的每个 commit 都有有意义的主题行和描述 / Each commit in the PR has a meaningful subject line and body

代码质量 / Code Quality:

• 我的代码遵循项目的代码规范 / My code follows the project's coding standards
• 我已经进行了自我代码审查 / I have performed a self-review of my code
• 我已经为复杂的代码添加了必要的注释 / I have commented my code, particularly in hard-to-understand areas

测试要求 / Testing Requirements:

• 我已经编写了必要的单元测试来验证逻辑正确性 / I have written necessary unit-tests to verify the logic correction
• 当存在跨模块依赖时，我尽量使用了 mock / I have used mocks when cross-module dependencies exist
• 基础检查通过：mvn -B clean package -Dmaven.test.skip=true / Basic checks pass
• 单元测试通过：mvn clean install / Unit tests pass

文档和兼容性 / Documentation and Compatibility:

• 我已经更新了相应的文档 / I have made corresponding changes to the documentation
• 如果有破坏性变更，我已经在 PR 描述中详细说明 / If there are breaking changes, I have documented them in detail
• 我已经考虑了向后兼容性 / I have considered backward compatibility

📋 附加信息 / Additional Notes

---

审查者注意事项 / Reviewer Notes: