feat(web): implement credential management UI
Enable Add Credential button, implement add/rotate/delete dialogs, wire CRUD operations to existing /api/credentials endpoints. Displays credentials in responsive table/card layout (name, type, scope, masked value, created date). Supports all credential types (API_KEY, OAUTH_TOKEN, ACCESS_TOKEN, SECRET, PASSWORD, CUSTOM) and scopes (USER, WORKSPACE, SYSTEM). Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
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