feat(distribution): 补齐退款加价回退、本站自卖与开通默认规则

退款时压缩卖方加价，人工/自动批次仅完结单可入账，号主收入进主站钱包；仲裁后重算释放并支持作废未入账 DS。开通时四种模式按默认生效，对外口径合并为 35/40/25，不再单独展示通道费。

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

frontend/src/features/admin/utils/distributionLabels.ts

@@ -16,6 +16,11 @@ export const DISTRIBUTION_MODES = [
     label: '三方分账',
     hint: '分站卖另一分站的货',
   },
+  {
+    value: 'site_self_sell',
+    label: '本站自卖',
+    hint: '分站卖本站货，卖出站拿 75%',
+  },
 ] as const
 
 const MODE_LABELS: Record<string, string> = Object.fromEntries(
@@ -46,10 +51,6 @@ export function formatRatioPercent(value?: number) {
   return `${n.toFixed(n % 1 === 0 ? 0 : 1)}%`
 }
 
-export function formatPaymentFeeBps(bps?: number) {
-  return `${Number(bps || 0) / 100}%`
-}
-
 export function ruleSplitParts(rule: DistributionRule) {
   switch (rule.mode) {
     case 'two_party_distributor_receive':
@@ -67,6 +68,8 @@ export function ruleSplitParts(rule: DistributionRule) {
         { label: '收号站', value: formatRatioPercent(rule.distributor_a_ratio) },
         { label: '卖出站', value: formatRatioPercent(rule.distributor_b_ratio) },
       ]
+    case 'site_self_sell':
+      return [{ label: '本站卖出', value: formatRatioPercent(rule.distributor_sell_ratio) }]
     default:
       return []
   }