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.

packages/ui/src/lib/configSync.ts

@@ -1,4 +1,4 @@
-export type ConfigChangeScope = "agents" | "providers" | "commands" | "all";
+export type ConfigChangeScope = "agents" | "providers" | "commands" | "skills" | "all";
 
 export interface ConfigChangeEvent {
   scopes: ConfigChangeScope[];

packages/ui/src/lib/toolHelpers.ts

@@ -148,6 +148,14 @@ export const TOOL_METADATA: Record<string, ToolMetadata> = {
      category: 'system',
      outputLanguage: 'json',
      inputFields: []
+   },
+   skill: {
+     displayName: 'Load Skill',
+     category: 'ai',
+     outputLanguage: 'markdown',
+     inputFields: [
+       { key: 'name', label: 'Skill Name', type: 'text' }
+     ]
    }
  };