fix(openwebui-skills-manager): replace broken install example URLs

- Replace non-existent anthropics skills paths with valid xlsx/docx examples.

- Keep English and Chinese README examples synchronized.

plugins/tools/openwebui-skills-manager/README.md

@@ -34,12 +34,12 @@ This tool can fetch and install skills directly from URLs (supporting GitHub tre
 
 ### Install a single skill from GitHub
 
-- "Install skill from <https://github.com/anthropics/skills/tree/main/skills/search_manager>"
+- "Install skill from <https://github.com/anthropics/skills/tree/main/skills/xlsx>"
 - "Install skill from <https://github.com/Fu-Jie/openwebui-extensions/blob/main/.agent/skills/test-copilot-pipe/SKILL.md>"
 
 ### Batch install multiple skills
 
-- "Install these skills: ['https://github.com/anthropics/skills/tree/main/skills/search_manager', 'https://github.com/anthropics/skills/tree/main/skills/guide_writer']"
+- "Install these skills: ['https://github.com/anthropics/skills/tree/main/skills/xlsx', 'https://github.com/anthropics/skills/tree/main/skills/docx']"
 
 > **Tip**: For GitHub, the tool automatically resolves directory (tree) URLs by looking for `SKILL.md` or `README.md`.
 

plugins/tools/openwebui-skills-manager/README_CN.md

@@ -34,12 +34,12 @@
 
 ### 从 GitHub 安装单个技能
 
-- “从 <https://github.com/anthropics/skills/tree/main/skills/search_manager> 安装技能”
+- “从 <https://github.com/anthropics/skills/tree/main/skills/xlsx> 安装技能”
 - “安装技能 <https://github.com/Fu-Jie/openwebui-extensions/blob/main/.agent/skills/test-copilot-pipe/SKILL.md”>
 
 ### 批量安装多个技能
 
-- “安装这些技能：['https://github.com/anthropics/skills/tree/main/skills/search_manager', 'https://github.com/anthropics/skills/tree/main/skills/guide_writer']”
+- “安装这些技能：['https://github.com/anthropics/skills/tree/main/skills/xlsx', 'https://github.com/anthropics/skills/tree/main/skills/docx']”
 
 > **提示**：对于 GitHub 链接，工具会自动处理目录（tree）地址，并尝试查找目录下的 `SKILL.md` 或 `README.md` 文件。