feat: enhance web search plugin configuration

- Added `sources` array to the default web search configuration, allowing for multiple source types including 'web', 'x', and 'news'.
- This update improves the flexibility and functionality of the web search plugin.

packages/aiCore/src/core/plugins/built-in/webSearchPlugin/helper.ts

@@ -47,7 +47,8 @@ export const DEFAULT_WEB_SEARCH_CONFIG: WebSearchPluginConfig = {
   xai: {
     mode: 'on',
     returnCitations: true,
-    maxSearchResults: 5
+    maxSearchResults: 5,
+    sources: [{ type: 'web' }, { type: 'x' }, { type: 'news' }]
   },
   anthropic: {
     maxUses: 5