fix: [악성채권] JOIN 쿼리 나머지 컬럼 테이블 prefix 보완

- is_active, status 컬럼에도 bad_debts. prefix 추가
- BadDebtService, StatusBoardService 동일 수정

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Services/StatusBoardService.php

@@ -69,8 +69,8 @@ private function getBadDebtStatus(int $tenantId): array
     {
         $query = BadDebt::query()
             ->where('bad_debts.tenant_id', $tenantId)
-            ->where('status', BadDebt::STATUS_COLLECTING)
-            ->where('is_active', true);
+            ->where('bad_debts.status', BadDebt::STATUS_COLLECTING)
+            ->where('bad_debts.is_active', true);
 
         $count = (clone $query)->count();