Port post-migration Splice docs updates

[danielporterda]

Summary

Ports the remaining documentation deltas from canton-network/splice after the initial cf-docs copy and after the partial refresh in 0baa65af.

Changes included:

• Add the Scan Bulk Data API traffic_summary and app_activity_records sections for CIP-0104 preview fields.
• Add SV Operations guidance for activityIngestionUserVersion.
• Add Logical Synchronizer Upgrade guidance for additionalLegacy synchronizers.
• Remove the upstream-deleted Grafana Dashboards section from Splice Metrics Overview.
• Add Splice release notes for 0.6.4 and 0.6.5.
• Remove the deleted-source SV and Validator major-upgrade pages, remove them from nav, and redirect their old routes to Logical Synchronizer Upgrade.
• Update Exchange Node Operations so it no longer links to deleted major-upgrade routes or the removed Grafana section.

Notes

The audit found one remaining target-side provenance issue that this PR intentionally does not resolve: docs-main/global-synchronizer/reference/splice-metrics.mdx points at splice:docs/src/deployment/observability/metrics_reference.rst, but that source path is missing in current splice/main. That looks like stale source metadata rather than a source change to port.

Validation

• jq empty docs-main/docs.json
• git diff --check
• Raw source-hash recheck: only the known stale splice-metrics.mdx provenance marker remains
• direnv exec /Users/danielporter/control/.worktrees/splice-docs-migration-audit-cf-docs npx mintlify validate from docs-main

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[hrischuk-da]

My feedback via Slack

I am looking at https://github.com/canton-network/cf-docs/pull/616/changes.  I see sv-major-upgrade.mdx and validato-major-upgrade.mdx were deleted.  I'm not sure that is the right thing.  Those files may need to exist with a disclaimer that they don't apply to DevNet and that LSU is the mechanism.

I think a similar thing DevNet/TestNet/MainNet tab is needed for the Grafana dashboards  (docs-main/global-synchronizer/production-operations/splice-metrics-overview.mdx) where the release notes say
Observability
 - The release bundle now ships a separate Grafana dashboard folder validator-grafana-dashboards/ for Validator operators.

You may need to check with @Itai Segall.

For the other items, can you do a side by side comparison of the old splice docs and the new doc site.

[danielporterda]

For the other items, can you do a side by side comparison of the old splice docs and the new doc site.

performed a comparison. confirming the copy worked faithfully.