feat(platform): checkpoint current implementation state

packages/db/prisma/migrations/20260330_vacation_deduction_snapshots.sql

@@ -0,0 +1,8 @@
+ALTER TABLE "vacations"
+  ADD COLUMN "deductedDays" DOUBLE PRECISION,
+  ADD COLUMN "holidayCountryCode" TEXT,
+  ADD COLUMN "holidayCountryName" TEXT,
+  ADD COLUMN "holidayFederalState" TEXT,
+  ADD COLUMN "holidayMetroCityName" TEXT,
+  ADD COLUMN "holidayCalendarDates" JSONB,
+  ADD COLUMN "holidayLegacyPublicHolidayDates" JSONB;

packages/db/prisma/schema.prisma

@@ -1363,6 +1363,13 @@ model Vacation {
   rejectionReason String?
   isHalfDay      Boolean        @default(false)
   halfDayPart    String?        // "MORNING" | "AFTERNOON"
+  deductedDays   Float?
+  holidayCountryCode String?
+  holidayCountryName String?
+  holidayFederalState String?
+  holidayMetroCityName String?
+  holidayCalendarDates Json?    @db.JsonB
+  holidayLegacyPublicHolidayDates Json? @db.JsonB
   requestedById  String
   approvedById   String?
   approvedAt     DateTime?