Enforce renewal on 1st of month for all participants

New billing rule: everyone renews on the 1st, full program price.
New enrollees pay pro-rata for remainder of first month, then renew
normally on the 1st going forward.

- advanceEnrollmentBillingDate() always sets next_billing_date to 1st
  of next month
- calculateFirstBillingDate() same: 1st of next month
- DB: set 44 un-renewed enrollments to 2026-08-01 (left 207 already-
  renewed at 2026-09-01 untouched)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Domain/Training/Services/EnrollmentService.php

@@ -442,21 +442,8 @@ private function calculateFirstBillingDate(?TrainingProgram $program): ?string
             return null;
         }
 
-        // Default to monthly day-1 if not set
-        $cycle = $program->billing_cycle ?? 'monthly';
-        $billingDay = $program->billing_day ?? 1;
-        $start = now();
-
-        $next = match ($cycle) {
-            'monthly' => $this->snapToDay($start->copy()->addMonth(), $billingDay),
-            'quarterly' => $start->copy()->addMonths(3),
-            'semi_annual' => $start->copy()->addMonths(6),
-            'annual' => $start->copy()->addYear(),
-            'per_duration' => $start->copy()->addWeeks($program->program_duration_weeks ?? 4),
-            default => $this->snapToDay($start->copy()->addMonth(), $billingDay),
-        };
-
-        return $next->toDateString();
+        // All renewals happen on the 1st of next month
+        return now()->addMonth()->startOfMonth()->toDateString();
     }
 
     private function snapToDay(\Illuminate\Support\Carbon $date, ?int $billingDay): \Illuminate\Support\Carbon

app/Livewire/Receptionist/CollectPaymentWizard.php

@@ -188,7 +188,7 @@ private function generatePendingRenewals(): void
         $enrollments = Enrollment::where('participant_id', $this->selected_participant_id)
             ->where('status', EnrollmentStatus::Active)
             ->whereNotNull('next_billing_date')
-            ->where('next_billing_date', '<=', now()->endOfMonth()->toDateString())
+            ->where('next_billing_date', '<=', now()->toDateString())
             ->whereHas('program', function ($q) {
                 $q->whereIn('renewal_policy', [
                     RenewalPolicy::AutoRenew->value,
@@ -213,22 +213,8 @@ private function generatePendingRenewals(): void
 
     private function advanceEnrollmentBillingDate(Enrollment $enrollment): void
     {
-        $program = $enrollment->program;
-        $current = $enrollment->next_billing_date;
-
-        $next = match ($program->billing_cycle) {
-            'monthly' => $current->copy()->addMonth(),
-            'quarterly' => $current->copy()->addMonths(3),
-            'semi_annual' => $current->copy()->addMonths(6),
-            'annual' => $current->copy()->addYear(),
-            'per_duration' => $current->copy()->addWeeks($program->program_duration_weeks ?? 4),
-            default => $current->copy()->addMonth(),
-        };
-
-        if ($program->billing_cycle === 'monthly' && $program->billing_day) {
-            $maxDay = $next->daysInMonth;
-            $next->day = min($program->billing_day, $maxDay);
-        }
+        // All renewals are on the 1st of next month — no exceptions
+        $next = now()->addMonth()->startOfMonth();
 
         $enrollment->update(['next_billing_date' => $next->toDateString()]);
     }