Onboarding ProvidersStep now reads the 26-entry CONNECTOR_CATALOG and
renders featured connectors (claude-pro, openai-codex, anthropic, openai,
amazon-bedrock) up front with a collapsible advanced list for the
remaining 21. Each auth kind gets a dedicated card component: OAuth
button flow, inline API-key form, and a cloud deep-link to Settings.
Delete legacy Claude/Codex/Gemini hardcoded cards and the compatible-API
slot rotation. Swap ModelManagement Settings panel for the new
ProvidersPanel driven by credentialsList IPC.