fix(waiver): fix missing 'description' column in installment_plans query

The column is 'notes', not 'description'.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Modules/Waiver/Services/WaiverProcessor.php

@@ -217,7 +217,7 @@ final class WaiverProcessor
 
         // 3. Installments (active/overdue installment plans)
         $installments = $db->select(
-            "SELECT s.id, s.due_date, (s.amount - s.paid_amount) as due, p.description as plan_desc
+            "SELECT s.id, s.due_date, (s.amount - s.paid_amount) as due, p.notes as plan_desc
              FROM installment_schedule s JOIN installment_plans p ON p.id = s.installment_plan_id
              WHERE p.member_id = ? AND p.status IN ('active','overdue') AND s.status IN ('pending','overdue') AND (s.amount - s.paid_amount) > 0",
             [$memberId]