refactor(pay): 统一流水号，移除订单/流水/提现三类号码前缀

订单号、资金流水号、提现单号此前各自带前缀配置，同一笔业务在不同界面会
呈现多个号码口径，对账与客诉排查都要先做一次前缀换算。现收敛为单一流水号
分配器，不再按业务类型区分号码形态。

- 删除 payment_order_prefix / payment_flow_prefix /
  payment_withdrawal_prefix 三项配置项及其生成、校验链路
- BusinessNumber::allocate() 成为唯一入口，输出 {YmdHis}{6 位随机}，
  共 20 位无前缀，满足 VARCHAR(32) 与网关 out_trade_no ≤ 32 的限制
- 订单、资金流水、提现、卡密渠道交易号四处生成点全部改走该分配器
- 后台支付中心表头「订单号 / 提现单号」统一为「流水号」
- 前台用户中心与订单卡片文案同步统一；前台订单详情合并为单行流水号，
  账本流水号不再下发到前台，避免同一单据出现两个对外号码
- 同步更新 financial-flow / pay-card / card-pass-order-numbers 契约测试
  与 BusinessNumberTest 断言

按用户要求不做双路逻辑与数据迁移，直接替换为统一方案，历史行不做转换。

验证：node --test tests/**/*.test.cjs 362/364 通过，新增 37 项契约；失败的
2 项在改动前的干净 HEAD 基线上同样失败（基线 327 项 / 失败 2 项），分别命中
遗留的 fa fa- 标记与 FA 版本号断言，与本次改动无关。phpunit 44 项 / 103
断言全部通过；php -l 全部改动的 PHP 文件通过。

src/Settings/CreditsPaymentGroups.php

@@ -169,7 +169,7 @@ trait CreditsPaymentGroups {
     /**
      * 获取订单设置
      *
-     * @return array{prefix:string,flow_prefix:string,withdrawal_prefix:string,expiry:int,show_user:bool,show_paycount:bool,no_logged_in:bool,cookie_day:int,no_logged_remind:bool,wait_float:bool,mark:string,box_position:string,show_ip:bool,show_device:bool,show_order_no:bool,show_create_time:bool,show_pay_time:bool,status_texts:array,service:array}
+     * @return array{expiry:int,show_user:bool,show_paycount:bool,no_logged_in:bool,cookie_day:int,no_logged_remind:bool,wait_float:bool,mark:string,box_position:string,show_ip:bool,show_device:bool,show_order_no:bool,show_create_time:bool,show_pay_time:bool,status_texts:array,service:array}
      */
     public static function get_order_settings(): array {
         return PaymentRuntime::get_order_settings();

src/Settings/MailTemplates.php

@@ -14,8 +14,8 @@ final class MailTemplates {
     public static function definitions(): array {
         return [
             'links_submit_admin' => self::event('友情链接提交通知', '新友情链接提交：{title}\n提交人：{username}\n链接：{url}\n请登录后台审核。', ['title', 'username', 'url']),
-            'order_paid_admin' => self::event('新订单通知（管理员）', '收到一笔新订单。\n订单号：{order_number}\n用户：{username}\n商品：{product}\n金额：{amount} {currency}\n支付方式：{payment_method}', ['order_number', 'username', 'product', 'amount', 'currency', 'payment_method']),
-            'withdraw_submitted_admin' => self::event('提现申请通知（管理员）', '用户 {username} 提交了提现申请。\n提现单号：{withdrawal_number}\n金额：{amount}\n方式：{method}', ['username', 'withdrawal_number', 'amount', 'method']),
+            'order_paid_admin' => self::event('新订单通知（管理员）', '收到一笔新订单。\n流水号：{order_number}\n用户：{username}\n商品：{product}\n金额：{amount} {currency}\n支付方式：{payment_method}', ['order_number', 'username', 'product', 'amount', 'currency', 'payment_method']),
+            'withdraw_submitted_admin' => self::event('提现申请通知（管理员）', '用户 {username} 提交了提现申请。\n流水号：{withdrawal_number}\n金额：{amount}\n方式：{method}', ['username', 'withdrawal_number', 'amount', 'method']),
             'post_pending_admin' => self::event('投稿待审核通知', '用户 {username} 提交了待审核内容：{title}\n查看地址：{url}', ['username', 'title', 'url']),
             'auth_apply_admin' => self::event('身份认证申请通知', '用户 {username} 提交了身份认证申请，请登录后台审核。\n查看地址：{url}', ['username', 'url']),
             'ban_appeal_admin' => self::event('账号申诉通知', '用户 {username} 提交了账号申诉。\n查看地址：{url}', ['username', 'url']),
@@ -27,9 +27,9 @@ final class MailTemplates {
             'password_reset' => self::event('密码重置验证码', '您好 {username}，\n\n您正在重置 {site_name} 的账号密码，验证码为：\n\n【{code}】\n\n验证码 10 分钟内有效。如非本人操作，请忽略此邮件。', ['username', 'site_name', 'code']),
             'change_code' => self::event('敏感操作验证码', '您好 {username}，\n\n您正在进行敏感操作，验证码为：\n\n【{code}】\n\n验证码 5 分钟内有效。如非本人操作，请忽略此邮件。', ['username', 'site_name', 'code']),
             'change_notice' => self::event('账号邮箱已变更', '您好 {username}，\n\n您的账号邮箱已成功修改为：{new_email}\n\n如果这不是您的操作，请立即联系站点管理员。', ['username', 'site_name', 'new_email']),
-            'order_paid' => self::event('订单支付成功', '您好 {username}，\n\n您的订单已支付成功。\n订单号：{order_number}\n商品：{product}\n金额：{amount} {currency}\n\n查看订单：{url}', ['username', 'order_number', 'product', 'amount', 'currency', 'url']),
+            'order_paid' => self::event('订单支付成功', '您好 {username}，\n\n您的订单已支付成功。\n流水号：{order_number}\n商品：{product}\n金额：{amount} {currency}\n\n查看订单：{url}', ['username', 'order_number', 'product', 'amount', 'currency', 'url']),
             'order_status' => self::event('订单状态更新', '您好 {username}，\n\n您的订单 {order_number} 状态已更新为：{status}。\n商品：{product}\n查看详情：{url}', ['username', 'order_number', 'status', 'product', 'url']),
-            'withdraw_submitted' => self::event('提现申请已提交', '您好 {username}，\n\n您的提现申请已提交。\n提现单号：{withdrawal_number}\n金额：{amount}\n方式：{method}', ['username', 'withdrawal_number', 'amount', 'method']),
+            'withdraw_submitted' => self::event('提现申请已提交', '您好 {username}，\n\n您的提现申请已提交。\n流水号：{withdrawal_number}\n金额：{amount}\n方式：{method}', ['username', 'withdrawal_number', 'amount', 'method']),
             'withdraw_completed' => self::event('提现状态更新', '您好 {username}，\n\n您的提现申请 {withdrawal_number} 当前状态为：{status}。\n金额：{amount}\n{note}', ['username', 'withdrawal_number', 'status', 'amount', 'note']),
             'affiliate_commission' => self::event('返佣到账通知', '您好 {username}，\n\n您的推广返佣已到账。\n金额：{amount}\n来源订单：{order_number}\n查看收益：{url}', ['username', 'amount', 'order_number', 'url']),
             'creator_income' => self::event('创作分成到账通知', '您好 {username}，\n\n您的创作分成已到账。\n金额：{amount}\n来源订单：{order_number}\n查看收益：{url}', ['username', 'amount', 'order_number', 'url']),

src/Settings/PaymentRuntime.php

@@ -454,9 +454,6 @@ class PaymentRuntime {
         }
 
         return [
-            'prefix'            => sanitize_text_field((string) ($s['payment_order_prefix'] ?? 'AKSRT')),
-            'flow_prefix'       => \AKSRT\Finance\BusinessNumber::normalize_prefix($s['payment_flow_prefix'] ?? 'AK', 'AK'),
-            'withdrawal_prefix' => \AKSRT\Finance\BusinessNumber::normalize_prefix($s['payment_withdrawal_prefix'] ?? 'TX', 'TX'),
             'expiry'            => $expiry,
             'show_user'         => !isset($s['pay_show_user']) || !empty($s['pay_show_user']),
             'show_paycount'     => !isset($s['pay_show_paycount']) || !empty($s['pay_show_paycount']),