feat: Implement skill management functionality

- Added skill scope helpers and CRUD operations for skills in opencodeConfig.ts.
- Introduced API endpoints for skill management in main.tsx and index.js.
- Enhanced server-side logic to support skill discovery, creation, updating, and deletion.
- Implemented supporting file operations for skills, including reading, writing, and deleting files.
- Updated package.json to use the latest version of @opencode-ai/sdk.

package.json

@@ -62,7 +62,7 @@
     "@heroui/system": "^2.4.23",
     "@heroui/theme": "^2.4.23",
     "@ibm/plex": "^6.4.1",
-    "@opencode-ai/sdk": "^1.0.185",
+    "@opencode-ai/sdk": "^1.0.209",
     "@radix-ui/react-collapsible": "^1.1.12",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",