docs(registry): document Russian Gitea contour and backup evidence

docs/registry/REGISTRY_READINESS_CHANGELOG_RU.md

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+# Registry readiness changelog
+
+## 2026-06-20 / 2026-06-21
+
+Added:
+
+- REG.RU/Gitea Russian Git contour documentation.
+- Self-hosted Gitea repository reference:
+  `https://git.iri1968.dpdns.org/awatch-rus/AWatch-rus`.
+- GitHub role as public mirror only.
+- Gitea backup/restore runbook.
+- Registry evidence manifest updates for Gitea, backup ZIP, SHA256 checksum,
+  systemd timer and restore status.
+- Registry readiness check script for the new `docs/registry/` package.
+
+Changed:
+
+- README now contains a short Registry-readiness infrastructure block.
+
+Runtime impact:
+
+- No runtime/product code changes.
+- No API changes.
+- No UI changes.
+- Rust/runtime checks not required: documentation-only change.
+
+Remaining gaps:
+
+- Legal rightsholder confirmation.
+- Russian build-runner.
+- Release artifacts storage in RF.
+- Tested restore procedure.
+- Documented access control policy.
+- Documented backup offsite copy.
+- Final registry legal review.