fix(settlement): 门店 T+1 出账日改为窗口中的今天

HQ 门店账单列名改为出账日；billDate 记今日（昨日 00:00–今日 00:00 右端），启动时把旧数据从核销自然日对齐过来。

Co-authored-by: Cursor <cursoragent@cursor.com>

server/dukang-api/prisma/seed-finance-mock.ts

@@ -91,12 +91,12 @@ async function main() {
   await prisma.storeBill.deleteMany({ where: { billNo: { startsWith: 'SBMOCK' } } });
   await prisma.partnerBill.deleteMany({ where: { billNo: { startsWith: 'PBMOCK' } } });
 
-  // ─── 1. 门店账单（昨日未打款 + 前日已打款）───
+  // ─── 1. 门店账单（今日出账未打款 + 昨日出账已打款）───
   const storeBillUnpaid = await prisma.storeBill.create({
     data: {
       billNo: billNo('SB', `${yesterday.getTime()}U`),
       storeId: store.id,
-      billDate: yesterday,
+      billDate: today,
       redeemCount: 5,
       redeemAmount: 1500,
       settlementRate: 0.6,
@@ -108,7 +108,7 @@ async function main() {
     data: {
       billNo: billNo('SB', `${dayBefore.getTime()}P`),
       storeId: store.id,
-      billDate: dayBefore,
+      billDate: yesterday,
       redeemCount: 3,
       redeemAmount: 800,
       settlementRate: 0.6,