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>

distribution-admin/src/api.ts

@@ -152,6 +152,8 @@ export interface DistributionOrder {
   handoff_status?: string
   refund_status: string
   settlement_status: string
+  distributor_settlement_status?: string
+  release_at?: string
   distribution_mode: string
   gross_paid_amount_cent?: number
   refund_amount_cent?: number
@@ -504,6 +506,7 @@ export interface SiteWallet {
   site_id: number
   available_balance_cent: number
   frozen_balance_cent: number
+  pending_release_cent: number
   total_settled_cent: number
   total_withdrawn_cent: number
 }