feat(admin,api,player): 返水流程优化、账单详情与数据库重置

优化返水预览/确认/作废，新增玩家账变详情与后台一键重置为 seed 数据，并修复 dev 启动时 3000 端口占用。

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

apps/api/prisma/migrations/20260608100000_cashback_detail_fields/migration.sql

@@ -0,0 +1,6 @@
+-- AlterTable
+ALTER TABLE "cashback_batches" ADD COLUMN "total_effective_stake" DECIMAL(18,4) NOT NULL DEFAULT 0;
+ALTER TABLE "cashback_batches" ADD COLUMN "total_bet_count" INTEGER NOT NULL DEFAULT 0;
+
+-- AlterTable
+ALTER TABLE "cashback_items" ADD COLUMN "bet_count" INTEGER NOT NULL DEFAULT 0;