chore(release): umbrella 0.4.70 — pin release-branch image builds

[cyberantonz]

Manual equivalent of the publish-chart job, which does not yet run on release branches (CI gap, fix in flight: #2097). The release branch carries the identity-resolution seed CronJob template (#2046 backport) but no chart containing it was ever published — the last publish from this branch is 0.4.68, which predates the backport.

• Pin backend subchart appVersions + ingestion.toolboxImage to the branch-built tag 2026.07.31.06.52-bf09d6a.release-2026.07.1 (all verified present on GHCR).
• Pin frontend subchart appVersion to 2026.07.31.06.52-0bb785c.release-2026.07.1.
• Umbrella 0.4.68 → 0.4.70 (patch stream of this release branch; trunk is on 0.5.x), appVersion = max subchart appVersion, deploy/gitops/.insight-version moved along.

Chart.lock is unchanged (subchart chart versions didn't move). Verified helm template with the target environment's values renders the insight-identity-resolution-seed CronJob with the pinned image.

The chart artifact insight-0.4.70 is packaged from this commit and pushed to oci://ghcr.io/constructorfabric/charts/insight manually; the matching gitops chartVersion bump follows separately.

🤖 Generated with Claude Code

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