Phase 2. Each service grows a `*ForProperties` (plural) variant that
takes a resolved property id array; the existing single-property
functions now delegate to them with `[propertyId]`. The route layer
will compute the descendant set via getDescendantIds when the user
toggles "include sub-properties" — this commit only adds the readers
behind the scenes.
Also extends the checklist_scope enum with 'property' so checklists
can attach directly to a property and the rollup query has a
well-typed scope to filter on.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
