docs(openwebui-skills-manager): prioritize official marketplace install

- Update bilingual plugin README to use official marketplace as default install path.

- Keep manual paste installation as fallback and sync docs mirrors.

- Keep version unchanged at 0.2.1.

docs/plugins/tools/openwebui-skills-manager-tool.md

@@ -27,6 +27,10 @@ A standalone OpenWebUI Tool plugin for managing native Workspace Skills across m
 ## Installation
 
 1. Open OpenWebUI → Workspace → Tools
-2. Create Tool and paste:
-   - `plugins/tools/openwebui-skills-manager/openwebui_skills_manager.py`
+2. Install **OpenWebUI Skills Manager Tool** from the official marketplace
 3. Save and enable for your chat/model
+
+### Manual Installation (Alternative)
+
+- Create Tool and paste:
+   - `plugins/tools/openwebui-skills-manager/openwebui_skills_manager.py`

docs/plugins/tools/openwebui-skills-manager-tool.zh.md

@@ -27,6 +27,10 @@
 ## 安装方式
 
 1. 打开 OpenWebUI → Workspace → Tools
-2. 新建 Tool 并粘贴：
-   - `plugins/tools/openwebui-skills-manager/openwebui_skills_manager.py`
+2. 在官方市场安装 **OpenWebUI Skills 管理工具**
 3. 保存并在模型/聊天中启用
+
+### 手动安装（备选）
+
+- 新建 Tool 并粘贴：
+   - `plugins/tools/openwebui-skills-manager/openwebui_skills_manager.py`