feat(plugins): merge Skill management into plugins

tests/unit/agent-creation-dialog.test.tsx

@@ -47,7 +47,7 @@ describe('AgentCreationDialog plugin Skill availability', () => {
       onUpdate={onUpdate}
     />);
 
-    const checkbox = screen.getByRole('checkbox', { name: '绑定技能：Data Service' });
+    const checkbox = screen.getByRole('checkbox', { name: '绑定插件能力：Data Service' });
     expect(checkbox).toBeChecked();
     expect(checkbox).toBeDisabled();
     expect(screen.getByText('插件未启用；现有分配会保留，但当前不可用。')).toBeVisible();