feat: always allow editing of participants for internal bookings

Prior to this commit the mutability flag from BusProNet was evaluated
and would potentially conflict with this rule. This flag is now
completely ignored for internal bookings.

src/Form/Service/Condition/PersonalDataMutabilityCondition.php

@@ -18,6 +18,10 @@ use App\Form\Service\Contract\FieldConditionInterface;
  * FirstParticipantReadOnlyCondition handles agency-based read-only logic for first participant,
  * while this condition applies BPN mutability rules to all participants.
  *
+ * Exception: For internal agency bookings (agency code 0004), the BPN mutability flag
+ * is ignored for all participants. Agency staff need full control over participant data
+ * regardless of BPN's mutability restrictions.
+ *
  * In edit mode, BPN determines mutability based on business rules (e.g., payment status,
  * booking state, etc.). We must respect this flag to prevent users from attempting to
  * modify data that BPN will reject.
@@ -34,6 +38,9 @@ class PersonalDataMutabilityCondition implements FieldConditionInterface
      * that BPN does not allow modifications to this participant's data.
      * When true, personal data fields should be hidden and displayed as static text.
      *
+     * Exception: For internal agency bookings, always returns false to allow
+     * editing all participants regardless of BPN's mutability flag.
+     *
      * @param BookingDto           $bookingDto       The current booking data
      * @param int                  $participantIndex The index of the participant being evaluated
      * @param array<string, mixed> $formData         Current form data (unused)
@@ -42,6 +49,12 @@ class PersonalDataMutabilityCondition implements FieldConditionInterface
      */
     public function evaluate(BookingDto $bookingDto, int $participantIndex, array $formData): bool
     {
+        // For internal agency bookings, all participants are editable
+        // regardless of BPN's mutability flag
+        if ($bookingDto->isInternalAgencyBooking()) {
+            return false;
+        }
+
         $participant = $bookingDto->getParticipant($participantIndex);
         if (null === $participant) {
             return false;