fix: correct application cmpp credentials

api/src/billing/billing.service.spec.ts

@@ -143,6 +143,39 @@ describe('BillingService', () => {
     });
   });
 
+  it('allows negative manual recharge amounts for balance correction', async () => {
+    const prisma = createPrismaMock();
+    const service = new BillingService(prisma as never);
+
+    const order = await service.createManualRecharge({
+      tenantId: 'tenant-1',
+      amountCents: -300,
+      smsUnits: 0,
+      operatorId: 'admin-1',
+      remark: '人工冲正',
+    });
+
+    expect(order).toEqual(expect.objectContaining({ amountCents: -300, payMethod: 'manual_topup', status: 'paid' }));
+    expect(prisma.tenantAccount.update).toHaveBeenCalledWith({
+      where: { tenantId: 'tenant-1' },
+      data: { balanceCents: 700, smsUnits: 20 },
+    });
+    expect(prisma.accountTransaction.create).toHaveBeenCalledWith({
+      data: expect.objectContaining({
+        transactionType: 'recharge',
+        amountCents: -300,
+        balanceAfter: 700,
+        relatedType: 'recharge_order',
+      }),
+    });
+    expect(prisma.operationLog.create).toHaveBeenCalledWith({
+      data: expect.objectContaining({
+        action: 'billing.manual_recharge',
+        detail: expect.objectContaining({ amountCents: -300, remark: '人工冲正' }),
+      }),
+    });
+  });
+
   it('writes freeze, charge, release, refund, and adjustment transactions', async () => {
     const prisma = createPrismaMock();
     const service = new BillingService(prisma as never);