feat(02-01): schema columns, PWA vitest harness, ICS fixtures, RED test stubs

- Add calendarEvents.hasRrule boolean + idx_calendar_events_has_rrule index (Phase 2 pre-filter)
- Add calendars.isShared boolean for shared-family calendar identification
- Create apps/pwa/vitest.config.ts with jsdom environment
- Add vitest, @testing-library/react, jsdom, @testing-library/jest-dom to PWA devDependencies
- Add "test": "vitest run" script to apps/pwa/package.json
- Create three ICS fixtures: weekly-dst.ics (DST spanning), allday-birthday.ics, exdate-series.ics
- Create RED test stub expand.test.ts with concrete DST wall-clock assertions (10:00 local both sides of March 2026 boundary)
- Create RED test stub events.test.ts with 400 validation and color/isShared field contracts
- Create RED test stub hydrateEvents.test.ts with Temporal type and calendarId routing contracts (shared→"shared", personal→String(ownerUserId))
- Create RED test stub calendarConfig.test.ts with firstDayOfWeek 0→7 translation contract

apps/api/tests/fixtures/exdate-series.ics

@@ -0,0 +1,30 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//FamilySync//Test//EN
+BEGIN:VTIMEZONE
+TZID:America/New_York
+BEGIN:STANDARD
+DTSTART:19701101T020000
+RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
+TZOFFSETFROM:-0400
+TZOFFSETTO:-0500
+TZNAME:EST
+END:STANDARD
+BEGIN:DAYLIGHT
+DTSTART:19700308T020000
+RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
+TZOFFSETFROM:-0500
+TZOFFSETTO:-0400
+TZNAME:EDT
+END:DAYLIGHT
+END:VTIMEZONE
+BEGIN:VEVENT
+UID:weekly-exdate-series@familysync.test
+DTSTART;TZID=America/New_York:20260601T090000
+RRULE:FREQ=WEEKLY;COUNT=5
+EXDATE;TZID=America/New_York:20260615T090000
+SUMMARY:Weekly Series With Exdate
+DESCRIPTION:Weekly series with the June 15 occurrence excluded via EXDATE
+DURATION:PT30M
+END:VEVENT
+END:VCALENDAR