Implement display artifacts, pricing integrity, draft base and publish preview bundle

backend/docs/roadmap-status.md

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+# SVG Backend Roadmap Status
+
+## Closed or nearly closed
+
+- artifact registry foundation
+- display artifact storage
+- display current/svg/display/meta
+- backfill display artifacts base
+- pricing integrity base
+  - DB unique constraint
+  - duplicate handling
+- publish validation gate
+- versioning/publish base
+- audit base
+- editable draft foundation
+- version-aware pricing snapshot foundation
+- publish preview bundle
+- baseline override
+- preview cache
+- auto snapshot rebuild on pricing mutation
+
+## Notes
+
+The backend has moved beyond the initial upload/normalize/viewer baseline and now includes the core foundations for:
+- display artifact lifecycle
+- pricing consistency
+- draft/editable version groundwork
+- publish-time validation and preview preparation
+
+Further work remains around:
+- full edit API
+- maintenance/admin operations
+- regression fixtures for problematic SVG files
+- broader automated integration coverage