feat(stocking): 佣金不再参与利润计算

calcProfit 新车/二手车两个分支的公式移除 commission 减项，
佣金录入与提交保持不变。

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

src/composables/useStockingForm.ts

@@ -487,7 +487,7 @@ export function useStockingForm(isFinal = false, stockingId?: string | number) {
     )
   }
 
-  // 利润=收款价-官方指导价/二手挂牌价+优惠-手续费-改装费-配件费-fob运费-港杂-海运-佣金-挂账-购置税+预估退税
+  // 利润=收款价-官方指导价/二手挂牌价+优惠-手续费-改装费-配件费-fob运费-港杂-海运-挂账-购置税+预估退税（佣金不参与）
   const calcProfit = (it: any): number => {
     const targetCurrency = 'CNY' // 固定使用人民币
     const unit = convertCurrency(it.unit_price, it.unit_price_currency, targetCurrency)
@@ -516,11 +516,6 @@ export function useStockingForm(isFinal = false, stockingId?: string | number) {
       (it as any).ocean_freight_currency,
       targetCurrency
     )
-    const commission = convertCurrency(
-      it.commission ?? (it as any).commission,
-      (it as any).commission_currency,
-      targetCurrency
-    )
     const purchaseTax = convertCurrency(
       it.purchase_tax ?? (it as any).purchase_tax,
       (it as any).purchase_tax_currency,
@@ -570,7 +565,6 @@ export function useStockingForm(isFinal = false, stockingId?: string | number) {
           handling +
           port +
           ocean +
-          commission +
           purchaseTax +
           retention +
           increase +
@@ -599,7 +593,6 @@ export function useStockingForm(isFinal = false, stockingId?: string | number) {
         handling +
         port +
         ocean +
-        commission +
         purchaseTax +
         retention +
         increase +