feat(distribution): 通道费改主站承担，并按冷却期自动释放结算

利润不再扣支付通道费；站点可配置结算冷却期，到期自动入账，已释放后退款从收款站钱包回冲。同时修复当日自动批次无法追加、三方回冲打错钱包，以及测试库自增重置被 MySQL 统计缓存跳过的问题。

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

frontend/src/features/admin/api/adminDistribution.ts

@@ -10,6 +10,7 @@ export interface DistributionSite {
   display_account_enabled: boolean
   tax_enabled: boolean
   tax_rate_bps: number
+  settlement_hold_days: number
   created_at: string
 }
 
@@ -88,6 +89,7 @@ export interface OnboardDistributionSitePayload {
   display_account_enabled?: boolean
   tax_enabled?: boolean
   tax_rate_bps?: number
+  settlement_hold_days?: number
   distributor_receive_ratio?: number
   platform_sell_ratio?: number
   service_fee_value?: number
@@ -129,7 +131,13 @@ export async function updateDistributionSite(
   payload: Partial<
     Pick<
       DistributionSite,
-      'site_name' | 'domain' | 'status' | 'display_account_enabled' | 'tax_enabled' | 'tax_rate_bps'
+      | 'site_name'
+      | 'domain'
+      | 'status'
+      | 'display_account_enabled'
+      | 'tax_enabled'
+      | 'tax_rate_bps'
+      | 'settlement_hold_days'
     >
   >
 ) {