New filter types

Need description, real photo, and icon, all with an OK license

- [ ] Electronic bollard
- [ ] Fixed bollard
- [ ] Planter
- [ ] Pocket park
- [x] Diagonal filter (?)
- [ ] Banned turn (?)
- [ ] Some way to indicate there's nothing physically there, but the user has strong reason to believe the road won't be used for shortcutting

查找 codebase 中定义过滤器类型的位置，可能位于数据模型或配置文件中。查找其他过滤器类型的描述、照片和图标的现有示例。为列出的过滤器类型（electronic bollard、fixed bollard、planter、pocket park、diagonal filter、banned turn、non-physical indicator）研究并获取具有 OK 许可的适当资源。验证这些资源如何集成到 UI 或数据结构中，以及如何在其中进行引用。

由索引模型根据 Issue 内容生成。