docs(changelog): add v2.87.0 changelog

content/start/changelog/index-en-US.md

@@ -16,6 +16,10 @@ Version：Major.Minor.Patch (follow the **Semver** specification)
 
 ---
 
+#### 🎉 2.87.0 (2025-10-15)
+- 【Style】
+    - Dropdown, Modal, SideSheet, Popover, Tooltip add backdrop-filter to set related tokens [#2981](https://github.com/DouyinFE/semi-design/issues/2981)
+
 #### 🎉 2.87.0-beta.0 (2025-09-08)
 - 【Fix】
     - JsonViewer keyboard events are compatible with window [@anjiazhuyouxing](https://github.com/anjiazhuyouxing)

content/start/changelog/index.md

@@ -13,6 +13,10 @@ Semi 版本号遵循 **Semver** 规范（主版本号 - 次版本号 - 修订版
 -   修订版本号（patch）：仅会进行 bugfix，发布时间不限
 -   不同版本间的详细关系，可查阅 [FAQ](/zh-CN/start/faq)
 
+#### 🎉 2.87.0 (2025-10-15)
+- 【Style】
+    - Dropdown, Modal, SideSheet, Popover, Tooltip 增加 backdrop-filter 设置相关 token [#2981](https://github.com/DouyinFE/semi-design/issues/2981) [#2985](https://github.com/DouyinFE/semi-design/pull/2985)
+
 #### 🎉 2.87.0-beta.0 (2025-09-08)
 - 【Fix】
     - JsonViewer 键盘事件兼容window [@anjiazhuyouxing](https://github.com/anjiazhuyouxing) [#2979](https://github.com/DouyinFE/semi-design/pull/2979)