Fix: set membership_type to 'member' on enrollment

Participants were staying as 'non_member' after enrollment, causing
renewals to be priced at 900 (non-member) instead of 650 (member).
EnrollmentService now sets membership_type='member' on enrollment.

DB fix: updated 178 participants to 'member', corrected 124 unpaid
renewal invoices from 90000 to 65000 piasters.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Domain/Training/Services/EnrollmentService.php

@@ -95,9 +95,16 @@ public function enroll(Participant $participant, TrainingGroup $group, User $act
             // Update group count
             $this->groupService->incrementCount($group);
 
-            // Activate participant if still in registered status
+            // Activate participant and set as member on first enrollment
+            $updates = [];
             if ($participant->status->value === 'registered') {
-                $participant->update(['status' => 'active']);
+                $updates['status'] = 'active';
+            }
+            if (($participant->membership_type?->value ?? $participant->membership_type) === 'non_member') {
+                $updates['membership_type'] = 'member';
+            }
+            if ($updates) {
+                $participant->update($updates);
             }
 
             // Auto-create invoice if program has a price (skip if invoice already provided via options)