feat(distribution): 分站收号压价解耦买家价（方案 B 新口径）

核心语义反转：receive_cost_delta 为压价点数，收号比例 = 主站参考比例 R + 点数，
点数越大号主收号价越低；买家售价锚定主站参考比例推导，不再随收号价联动。

- 迁移 000072：distribution_sites 新增 receive_cost_delta（旧 receive_ratio_delta 保留只读）
- receive_pricing：新增 Normalize/ApplySiteReceiveCostDelta；分站定价买家侧改用
  R 锚点（referenceSellerCoinBasePrice），快照写入 site_receive_cost_delta 与 pricing_model 标记
- site_receive：新增 resolveSiteReceiveCostDelta 读取链路，旧 ResolveReceiveRatioDelta 保留
- 分成不变：压价差经结算层 profit 自动进入 35/40/25 三方分成池；
  货架自主加价仍 100% 归分站，两条边界均以主站为锚
- 权限对齐旧字段：主站全局管理员与分站操作员均可设置
- 前端三端同步：主站 pricing.ts/usePricingCalculator 买卖解耦试算、
  主站后台弹窗改「收号压价」价格语义文案、分销后台 SiteSettings 同步
- 测试：单测锚定 R=43 时 cost_delta=3 → 收号 217.4 / 卖价 263.2 不变 / markup 池 30.6→54.9

frontend/src/shared/composables/usePricingCalculator.ts

@@ -19,11 +19,10 @@ import {
   hasAcceleratedSaleRatioInput as hasAcceleratedSaleRatioValue,
   isQuantityItemDisabledForInsurance,
   readFinalSaleRatio,
-  applySiteReceiveRatioDelta,
+  applySiteReceiveCostDelta,
   roundMoney,
   roundRatio,
 } from '@/shared/utils/pricing'
-
 export function usePricingCalculator(options: {
   publishOptions: Ref<ListingPublishOptions>
   salePriceConfig: Ref<PublishSalePriceConfig>
@@ -34,6 +33,7 @@ export function usePricingCalculator(options: {
   selectedSkins: Ref<string[]>
   isDistribution?: Ref<boolean>
   receiveRatioDelta?: Ref<number>
+  receiveCostDelta?: Ref<number>
 }) {
   const serverOptions = computed(() => options.publishOptions.value.server_options)
   const faceOptions = computed(() => options.publishOptions.value.face_options)
@@ -91,12 +91,17 @@ export function usePricingCalculator(options: {
   const siteReceiveRatioDelta = computed(() =>
     Math.max(0, Number(options.receiveRatioDelta?.value || 0))
   )
+  const siteReceiveCostDelta = computed(() =>
+    Math.max(0, Number(options.receiveCostDelta?.value || 0))
+  )
+  // 分站新口径：收号价按「R + 压价点数」计算（压价收号）；买家定价仍按主站口径推导。
+  // 买卖两侧解耦：calculatedRatio 决定号主收号价，anchorRatio 决定买家价基准。
   const calculatedRatio = computed(() => {
     if (calculatedDefaultSaleRatio.value <= 0) return 0
     if (options.isDistribution?.value) {
-      return applySiteReceiveRatioDelta(
+      return applySiteReceiveCostDelta(
         calculatedDefaultSaleRatio.value,
-        siteReceiveRatioDelta.value
+        siteReceiveCostDelta.value
       )
     }
     return readFinalSaleRatio(
@@ -105,10 +110,19 @@ export function usePricingCalculator(options: {
       maxAcceleratedSaleRatio.value
     )
   })
+  const anchorRatio = computed(() => {
+    if (calculatedDefaultSaleRatio.value <= 0) return 0
+    if (options.isDistribution?.value) return calculatedDefaultSaleRatio.value
+    return calculatedRatio.value
+  })
   const calculatedCoinBasePrice = computed(() => {
     if (calculatedRatio.value <= 0) return 0
     return roundMoney(coinWanAmount.value / calculatedRatio.value)
   })
+  const anchorCoinBasePrice = computed(() => {
+    if (anchorRatio.value <= 0) return 0
+    return roundMoney(coinWanAmount.value / anchorRatio.value)
+  })
   const calculatedConsumablePrice = computed(() =>
     calculateConsumablePrice({
       quantityItems: quantityItems.value,
@@ -122,13 +136,18 @@ export function usePricingCalculator(options: {
       ? roundMoney(calculatedCoinBasePrice.value + calculatedConsumablePrice.value)
       : 0
   )
+  const anchorSellerPrice = computed(() =>
+    anchorRatio.value > 0
+      ? roundMoney(anchorCoinBasePrice.value + calculatedConsumablePrice.value)
+      : 0
+  )
   const calculatedPlatformPricing = computed(() =>
     calculatePlatformPricing({
       coinMAmount: coinMAmount.value,
       coinWanAmount: coinWanAmount.value,
-      sellerRatio: calculatedRatio.value,
-      sellerCoinBasePrice: calculatedCoinBasePrice.value,
-      sellerTotalPrice: calculatedSellerPrice.value,
+      sellerRatio: anchorRatio.value,
+      sellerCoinBasePrice: anchorCoinBasePrice.value,
+      sellerTotalPrice: anchorSellerPrice.value,
       consumablePrice: calculatedConsumablePrice.value,
       salePriceConfig: options.salePriceConfig.value,
     })
@@ -212,6 +231,7 @@ export function usePricingCalculator(options: {
     calculatedDefaultSaleRatio,
     maxAcceleratedSaleRatio,
     siteReceiveRatioDelta,
+    siteReceiveCostDelta,
     calculatedRatio,
     calculatedCoinBasePrice,
     calculatedConsumablePrice,

frontend/src/shared/utils/pricing.ts

@@ -165,6 +165,16 @@ export function applySiteReceiveRatioDelta(referenceRatio: number, delta: number
   return roundRatio(Math.max(referenceRatio - safeDelta, 0.01))
 }
 
+/**
+ * 分站收号压价（新口径）：收号比例 = 主站参考比例 R + 点数，比例变大 → 收号价更低。
+ * 买家价已解耦，不再从收号比例推导，始终锚定主站参考口径。
+ */
+export function applySiteReceiveCostDelta(referenceRatio: number, delta: number) {
+  if (referenceRatio <= 0) return 0
+  const safeDelta = Math.min(20, Math.max(0, Number(delta) || 0))
+  return roundRatio(referenceRatio + safeDelta)
+}
+
 export function hasAcceleratedSaleRatioInput(value: number | '' | null | undefined) {
   const ratio = Number(value)
   return (