fix(accounting): revert acc_dir to raw 0/1 to avoid charset issues

wwwroot/billing.dspy

@@ -19,7 +19,7 @@ ns = {
 
 async with get_sor_context(request._run_ns, 'accounting') as sor:
 	sql = """select d.acc_date, d.acc_timestamp,
-case when d.acc_dir = '0' then '借' else '贷' end as acc_dir,
+d.acc_dir,
 d.amount, d.balance, s.name as subject_name,
 count(*) over() as _total,
 coalesce(sum(case when d.acc_dir = '0' then d.amount else 0 end) over(), 0) as _debit,