feat: implement notification system with customizable options

[lhuans]

渲染器 notify 去除组件库依赖,保持多个渲染器一致性

Summary

• 去掉 @opentiny/vue-notify，改为内置 DOM toast（样式对齐 TinyVue Notify）
• 支持通过 RENDERER_SETTINGS 自定义 notify；挂在 page context，多 RenderMain 实例互不覆盖
• 与 materials 同模式：context 存 settings 对象引用，Notify 调用时再读 .notify，支持 handler 热更新

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