fix: [악성채권] tenant_id 컬럼 ambiguous 에러 수정

- JOIN 쿼리에서 bad_debts.tenant_id로 테이블 명시
- BadDebtService, StatusBoardService 동일 수정

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

app/Services/BadDebtService.php

@@ -86,7 +86,7 @@ public function summary(array $params = []): array
 
         // is_active=true인 악성채권만 통계
         $query = BadDebt::query()
-            ->where('tenant_id', $tenantId)
+            ->where('bad_debts.tenant_id', $tenantId)
             ->where('is_active', true);
 
         // 거래처 필터

app/Services/StatusBoardService.php

@@ -68,7 +68,7 @@ private function getOrdersStatus(int $tenantId, Carbon $today): array
     private function getBadDebtStatus(int $tenantId): array
     {
         $query = BadDebt::query()
-            ->where('tenant_id', $tenantId)
+            ->where('bad_debts.tenant_id', $tenantId)
             ->where('status', BadDebt::STATUS_COLLECTING)
             ->where('is_active', true);