feat(ticket): replace the after-sale flow with a general ticket system

The old 售后 flow was an order-refund appendage: tickets were hard-bound to an
order number, users could only file them from 「我的订单」against a paid order,
and the admin action bottomed out at 「标记订单已退款」. It could not carry
account questions or feature requests that have nothing to do with an order.

Replace it with a general ticket system modelled on 魔方财务云's idcsmart_ticket:
title + department + description are required, linking an order is optional
(user's own paid orders only). Add departments, custom statuses, preset replies
and internal admin notes as four configuration surfaces. Conversation history
moves off the ticket row's JSON log into dedicated ticket_reply rows, which
unlocks quoted replies. Front end gets a 工单中心 panel under 我的服务; back end
moves from 支付中心 → 售后服务 to users.php → 工单管理.

Per CLAUDE.md's rewrite-over-compatibility rule: drop the old table, build new
ones, delete the old code. No dual paths, no data migration. The upstream
plugin's upstream/downstream delivery and internal-ticket conversion are
deliberately left out — both are multi-provider platform concerns with no
meaning on a single WordPress site.

Data: order_aftersale becomes six aksrt_ticket* tables (ticket, ticket_reply,
ticket_status, ticket_type, ticket_prereply, ticket_note). SCHEMA_VERSION
2.6.0 -> 3.0.0. Status and department seeds are idempotent; the default status
「待接单」is flagged as non-editable.

Domain: new src/Ticket/ (13 files, all under 460 lines). Attachments reuse
UserController::rest_upload_comment_image with a ticket-specific permission
callback, mirroring the existing /report/upload-image route rather than
growing a second upload path.

Notifications go through AKSRT\Messages\Message::send() and deep-link to the
right surface; email/SMS stay out of scope since the theme's mail and SMS
stacks are separate implementations.

Refund gate opens up: marking an order refunded no longer requires an in-flight
ticket, only that the order is paid.

Also generalise a hardcoded special case in tools/audit-admin-contracts.php —
schema domain inference now reads the parent directory instead of matching
"PostList" by name, so new leaf schema files need no per-name exception.

Verification:
  php tools/audit-admin-contracts.php   exit 0, errors=0
  node --test (widget-system + admin)   664 pass / 0 fail
  php -l over all new/changed files     clean
  node --check over all JS              clean
  npm run build + build:public          clean

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Admin/Schema/Users/SchemaUsersTicket.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * 工单配置分区（域 users，分区 ticket）。
+ *
+ * 字段键、顺序、类型、默认值与文案需与
+ * assets/admin/src/schema/sections/users/ticket.js 保持 1:1
+ * （tests/widget-system/ticket-schema-contract.test.cjs 守护）。
+ *
+ * @package AKSRT
+ */
+
+namespace AKSRT\Admin\Schema\Users;
+
+defined('ABSPATH') || exit;
+
+class SchemaUsersTicket {
+
+    public static function build(): array {
+        return [
+            'key'        => 'ticket',
+            'title'      => '工单中心',
+            'version'    => '1.0.0',
+            'option_key' => 'aksrt_settings',
+            'groups'     => [
+                ['key' => 'main', 'title' => '工单功能', 'icon' => 'fa fas fa-headset', 'fields' => [
+                    ['key' => 'ticket_s', 'label' => '工单功能', 'type' => 'switch', 'default' => true, 'help' => '开启后用户可在用户中心提交工单；关闭后工单中心不再开放，后台工单列表仍可查看历史工单'],
+                    ['key' => 'ticket_num_prefix', 'label' => '工单号前缀', 'type' => 'input', 'default' => 'T', 'help' => '工单号形如「前缀+年月日+6位随机数」，仅支持字母与数字'],
+                    ['key' => 'ticket_notice_open', 'label' => '提交后显示平台公告', 'type' => 'switch', 'default' => true, 'help' => '开启后用户提交工单成功时展示下方公告内容'],
+                    ['key' => 'ticket_notice_text', 'label' => '公告内容', 'type' => 'textarea', 'sanitize_type' => 'html', 'rows' => 3, 'default' => '<div>提交工单后请耐心等待处理</div>', 'help' => '用户提交工单后展示的内容(支持HTML代码，请注意代码规范)'],
+                ]],
+                ['key' => 'form', 'title' => '提交设置', 'icon' => 'fa fas fa-file-alt', 'fields' => [
+                    ['key' => 'ticket_attachment_s', 'label' => '允许上传图片', 'type' => 'switch', 'default' => true, 'help' => '开启后工单内容与回复可上传图片（复用评论图片上传的大小与类型校验）'],
+                    ['key' => 'ticket_attachment_max', 'label' => '单个工单图片上限', 'type' => 'number', 'default' => 5, 'min' => 1, 'max' => 9, 'help' => '工单内容与每条回复各自可上传的图片数量上限'],
+                    ['key' => 'ticket_order_link_s', 'label' => '允许关联订单', 'type' => 'switch', 'default' => true, 'help' => '开启后新建工单时可选择关联本人一个已支付订单；关闭后工单与订单完全解耦'],
+                    ['key' => 'ticket_urge_interval', 'label' => '催单冷却(分钟)', 'type' => 'number', 'default' => 15, 'min' => 1, 'max' => 1440, 'help' => '同一工单两次催单之间的最小间隔'],
+                ]],
+            ],
+        ];
+    }
+}