Charge weekly reservations for every claimed occurrence and confirm the whole series

A weekly booking on a per-lesson (one_time) priced offering was creating its
single upfront payment for one week's price while reserving up to 12 weeks,
and settling that payment confirmed only the anchor lesson, leaving the rest
of the series pending forever.

- BookingEndpoint now charges price x claimed occurrences for one_time
  billing; a full_term price is still charged once since it covers the term.
- PaymentService::confirmRegistration resolves the anchor lesson's series and
  confirms every non-cancelled row via the new
  BookingRepository::updateStatusForSeries().

Closes #79

Co-Authored-By: Claude Fable 5 <[email protected]>

src/Booking/BookingRepository.php

@@ -214,6 +214,26 @@ class BookingRepository {
 		);
 	}
 
+	/**
+	 * Update every non-cancelled lesson in a weekly series at once — e.g.
+	 * confirming the whole reservation when its single upfront payment settles.
+	 */
+	public function updateStatusForSeries( int $seriesId, string $status ): bool {
+		if ( ! in_array( $status, Lesson::VALID_STATUSES, true ) ) {
+			return false;
+		}
+
+		$sql = $this->db->prepare(
+			'UPDATE %i SET status = %s WHERE series_id = %d AND status != %s',
+			$this->table,
+			$status,
+			$seriesId,
+			Lesson::STATUS_CANCELLED
+		);
+
+		return null !== $sql && false !== $this->db->query( $sql );
+	}
+
 	public function updateStatus( int $id, string $status ): bool {
 		if ( ! in_array( $status, Lesson::VALID_STATUSES, true ) ) {
 			return false;