Add ability to define completely different evaluation criteria for each
competition category. Admins toggle "Separate Criteria per Category" in
round config, then configure criteria independently via tabbed editor.
- Schema: add nullable `category` to EvaluationForm with updated constraints
- Config: add `perCategoryCriteria` boolean to EvaluationConfigSchema
- Helper: new `findActiveForm()` with category-aware resolution + fallback
- Backend: getForm, upsertForm, getStageForm, startStage all category-aware
- AI services: use project category for form lookup in summaries + ranking
- Export/ranking: merge criteria from all active forms for cross-category reports
- Admin UI: toggle switch + tabbed criteria editor with per-category builders
- Jury UI: auto-selects correct form based on project category (invisible to juror)
- Fully backwards compatible: toggle defaults OFF, existing forms unchanged
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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