docs: sync after #371 (dashboard rollup and warm-up services)

[Sev7eNup]

What & why

Nightly documentation-sync run for the window 2026-09-14T01:07Z → 2026-09-15T03:07Z.

#371 added three hosted services — ExecutionStatsRollupService, DashboardAggregateWarmup and WorkflowDefinitionFactsWarmup — and neither background-service inventory mentions any of them. Both inventories present themselves as covering what runs in the background, so a reader looking for what starts after boot, or for the switch that turns the precomputation off, found nothing.

Per doc change and the PR that caused it:

Doc	Change	Driven by
docs/claude-reference.md	Three rows in the background-services table with their gating; the intro now names Program.cs as the registration site for them and adds opt-out to the gating legend	#371
src/nodepilot-docs-ui/content/de/configuration/retention.md	ExecutionStatsRollupService + DashboardAggregateWarmup under "Andere Background-Services"; Stats:Rollup:Enabled in the stats key table; a note on what the buckets do and do not cover	#371
src/nodepilot-docs-ui/content/en/configuration/retention.md	Same, English tree	#371

How

Gating, sweep intervals, start delays and defaults were read off the services themselves (Stats:Rollup:Enabled and Dashboard:Warmup:Enabled both default to true; the rollup is leader-gated, the warm-up is process-local). Nothing here anticipates unmerged work — every claim is true on main at 24022ee.

WorkflowDefinitionFactsWarmup is listed only in docs/claude-reference.md: it has no switch and no operational knob, so it stays out of the operator-facing site.

Two notes for a human, tracked in #375:

• The background-services tables still omit six long-standing hosted services (AuthSessionCleanupService, DatabaseAvailabilityProbe, DirectorySynchronizationService, ExternalAuthorizationStalenessService, ThreadPoolTuningService, SignalRExecutionNotifier). That predates Precompute dashboard statistics into hourly buckets #371, and whether those tables are meant to be exhaustive or a curated subset is not a call this sync should make — hence the softened "Die Hosted-Services" instead of "Alle Hosted-Services" rather than a wholesale fill-in.
• Stats:Rollup:Enabled is documented but is not one of the two keys the Stats admin-settings section owns.

Testing

Docs only — no code paths touched. Markdown changes are additive rows and prose in files both language trees already carry, so the docs-site language-parity guard and DocumentationCountsTests see no new files and no changed counts.

• Docs updated (docs-ui content/de/ and content/en/)
• Branched off main; no direct commits to main
• Backend/frontend suites — not run; nothing executable changed

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Generated by Claude Code

[Sev7eNup]

Merged into main as a17cf8e through #382 (Release 1.4.0).