feat(11-03): surface reminderLeadMinutes on CalendarOccurrence + GET select (D-10)

- Add reminderLeadMinutes: number | null to CalendarOccurrence interface (D-06)
- Import classifyValarms in expand.ts; derive series-level value once per VEVENT
- Add reminderLeadMinutes to both non-recurring and recurring occurrence construction
- Add reminderLeadMinutes to GET /api/events select for edit-mode pre-population

apps/api/src/routes/events.ts

@@ -177,6 +177,8 @@ eventsRouter.get('/', zValidator('query', eventsQuerySchema), async (c) => {
         userId: users.id,
         userColor: users.color,
         ownerName: users.displayName,
+        // Phase 11 Plan 03: surface reminderLeadMinutes for edit-mode pre-population (D-06/D-10)
+        reminderLeadMinutes: calendarEvents.reminderLeadMinutes,
       })
       .from(calendarEvents)
       .innerJoin(calendars, eq(calendarEvents.calendarId, calendars.id))