refactor: unify agent marketplace to single endpoint with cursor pagination

- Replace multiple marketplace routes with unified /marketplace endpoint
  - Add query string controls: category, search, limit, cursor, promoted, requiredPermission
  - Implement cursor-based pagination replacing page-based system
  - Integrate ACL permissions for proper access control
  - Fix ObjectId constructor error in Agent model
  - Update React components to use unified useGetMarketplaceAgentsQuery hook
  - Enhance type safety and remove deprecated useDynamicAgentQuery
  - Update tests for new marketplace architecture
  -Known issues:
  see more button after category switching + Unit tests

packages/data-provider/src/keys.ts

@@ -41,6 +41,8 @@ export enum QueryKeys {
   promptGroup = 'promptGroup',
   categories = 'categories',
   randomPrompts = 'randomPrompts',
+  agentCategories = 'agentCategories',
+  marketplaceAgents = 'marketplaceAgents',
   roles = 'roles',
   conversationTags = 'conversationTags',
   health = 'health',