The frontend routing guard checks has_starter_deck to decide whether to
redirect users to starter selection. The field was missing from the API
response, causing authenticated users with a starter deck to be
incorrectly redirected to /starter on page refresh.
- Add has_starter_deck computed property to User model
- Add has_starter_deck field to UserResponse schema
- Add unit tests for User model properties
- Add API tests for has_starter_deck in profile response
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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