feat(properties): tree-aware readers for expenses, maintenance, checklists
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>
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