feat: model dropdown now uses server-side filtering

[IonesioJunior]

Summary

• Model dropdown (and data source selection) now correctly shows endpoints even when one type dominates the list
• Previously, getChatModels() and getChatDataSources() used client-side filtering after fetching mixed endpoint lists, causing empty results when 100+ data sources filled the page limit
• SDK's browse() and trending() methods now support endpointType parameter for server-side filtering
• Frontend functions updated to pass endpoint_type to the SDK, which forwards it to the backend API

Modified Files

• sdk/typescript/src/resources/hub.ts — Added endpointType to BrowseOptions and TrendingOptions interfaces; updated browse() and trending() methods to pass endpoint_type query parameter to backend
• components/frontend/src/lib/endpoint-utils.ts — Updated getPublicEndpoints() and getTrendingEndpoints() to use server-side filtering via SDK instead of client-side filtering

Test plan

• Build TypeScript SDK successfully
• Verify model dropdown shows models even when data sources dominate the endpoint list
• Verify data source dropdown shows data sources correctly
• Check that filtering works correctly for both browse() and trending() SDK methods

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