fix(admin): stop the ticket process form from white-screening on submit

The process form posted to admin-post.php without a hidden action field,
so no admin_post_{action} hook fired and WordPress returned a blank
page. Dispatch to aksrt_users_update_report / aksrt_users_process_appeal
per ticket kind, matching every other native form, and lock the contract
in the report test.

tests/widget-system/report-ban-contract.test.cjs

@@ -162,6 +162,10 @@ test('native ban page mirrors the reference theme layout', () => {
   for (const label of [`__('立即处理', 'aksrt')`, `__('正在处理', 'aksrt')`, `__('被举报用户', 'aksrt')`, `__('被举报用户禁封信息', 'aksrt')`, `__('申诉用户', 'aksrt')`, `__('禁封信息', 'aksrt')`, `__('申诉信息', 'aksrt')`, `__('处理方式', 'aksrt')`, `__('处理留言', 'aksrt')`, `__('申诉通过（解封该用户）', 'aksrt')`, `__('申诉拒绝（保持原禁封状态）', 'aksrt')`, `__('此处内容会反馈给举报人', 'aksrt')`, `__('确认提交', 'aksrt')`, `__('用户状态正常', 'aksrt')`, `__('当前用户已解封', 'aksrt')`, `__('此用户已解封', 'aksrt')`, `__('暂无申请记录', 'aksrt')`]) {
     assert.ok(tickets.includes(label), `missing process form label: ${label}`)
   }
+  // 处理表单必须携带隐藏 action 字段：admin-post.php 靠它触发
+  // admin_post_{action} 钩子，缺失时 WordPress 不输出任何内容（白屏）。
+  assert.match(tickets, /name="action" value="aksrt_users_update_report"/)
+  assert.match(tickets, /name="action" value="aksrt_users_process_appeal"/)
 
   // 分页对齐参考主题 zibpay_admin_pagenavi（每页 20 条）
   assert.match(tickets, /TICKETS_PER_PAGE = 20/)