fix: remove duplicate word in list_metadata_objects description

Agent-Logs-Url: https://github.com/objectstack-ai/framework/sessions/96854b99-76e5-4225-8b77-ec8a660bc4ea

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

packages/services/service-ai/src/tools/metadata-tools.ts

@@ -221,7 +221,7 @@ export const DELETE_FIELD_TOOL: AIToolDefinition = {
 export const LIST_METADATA_OBJECTS_TOOL: AIToolDefinition = {
   name: 'list_metadata_objects',
   description:
-    'Lists all registered metadata data objects (tables) in the current environment. ' +
+    'Lists all registered metadata objects (tables) in the current environment. ' +
     'Use this when the user wants to see what tables, entities, or data models are defined in metadata.',
   parameters: {
     type: 'object',