feat: series-aware schedule edits + waitlist ledger removal (M32)

PATCH /v1/catalog/class-schedules/:id patches a recurring rule and,
with applyToFuture, retimes materialized future sessions to the new
local start time on their existing dates — moving confirmed and
waitlisted bookings with them and re-arming reminders. Zones-page
schedule rows gain an inline editor (CS/EN).

Also drops the vestigial waitlist_entries table (migration 00020):
positions derive from bookings.created_at, so the ledger was written
but never read.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

apps/backend/internal/bookings/service.go

@@ -365,19 +365,6 @@ func (s *Service) Create(ctx context.Context, request domain.CreateBookingReques
 		return domain.CreateBookingResponse{}, err
 	}
 
-	if status == "waitlisted" && request.ClassSessionID != nil {
-		waitlistPosition := int(countClassBookings(existing, *request.ClassSessionID)) + 1
-		if err := s.repo.AppendWaitlistEntry(ctx, db.WaitlistEntryParams{
-			TenantID:       tenant.ID,
-			ClassSessionID: *request.ClassSessionID,
-			CustomerName:   customerName,
-			CustomerEmail:  customerEmail,
-			Position:       waitlistPosition,
-		}); err != nil {
-			return domain.CreateBookingResponse{}, err
-		}
-	}
-
 	if err := armReminderJobs(ctx, s.repo, tenant.ID, created.ID, startsAt, request.CustomerPhone); err != nil {
 		return domain.CreateBookingResponse{}, err
 	}