fix: Contract, TaxProfile, TaxFilingSchedule에 대해 선제적으로 GetAllAsync API 및 구현체 추가

TaxBaik.Infrastructure/Repositories/ContractRepository.cs

@@ -16,6 +16,14 @@ public class ContractRepository(IDbConnectionFactory connectionFactory) : BaseRe
             contract);
     }
 
+    public async Task<IEnumerable<Contract>> GetAllAsync(CancellationToken cancellationToken = default)
+    {
+        using var conn = Conn();
+        return await conn.QueryAsync<Contract>(
+            @"SELECT id, client_id, contract_number, service_type, contract_date, start_date, end_date, monthly_fee, total_amount, payment_status, status, notes, created_at, updated_at
+              FROM contracts ORDER BY contract_date DESC");
+    }
+
     public async Task<Contract?> GetByIdAsync(int id, CancellationToken cancellationToken = default)
     {
         using var conn = Conn();