refactor(autoload): migrate theme classes to Composer PSR-4

Move 288 types from global AKSRT_* + inc/classes manual requires into
namespace AKSRT\{Domain} under src/AKSRT/, wire composer.json psr-4,
and slim bootstrap to helpers/modules/hooks only. Split multi-class
widget/gateway files, update admin contract audit paths, and document
the layout in ADR/README.

templates/pages/page-reset-password.php

@@ -17,7 +17,7 @@ defined('ABSPATH') || exit;
 // ============================================
 // 检测当前模式：设置密码 or 请求重置
 // ============================================
-$context = AKSRT_Auth_Service::get_reset_context($_GET);
+$context = \AKSRT\Auth\Service::get_reset_context($_GET);
 $mode    = $context['mode'];
 $errors  = [];
 $success = '';
@@ -34,7 +34,7 @@ if (!empty($context['error'])) {
 
 // 模式1：请求重置密码（忘记密码表单提交）
 if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['aksrt_action']) && $_POST['aksrt_action'] === 'request_reset') {
-    $result = AKSRT_Auth_Service::request_password_reset($_POST);
+    $result = \AKSRT\Auth\Service::request_password_reset($_POST);
     if (!empty($result['success'])) {
         $success = $result['message'] ?? __('如果该账号存在，重置邮件已发送到注册邮箱', 'aksrt');
     } else {
@@ -44,7 +44,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['aksrt_action']) && $_
 
 // 模式2：设置新密码（从邮件链接进入）
 if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['aksrt_action']) && $_POST['aksrt_action'] === 'set_password') {
-    $result = AKSRT_Auth_Service::reset_password_with_token($_POST);
+    $result = \AKSRT\Auth\Service::reset_password_with_token($_POST);
     if (!empty($result['success'])) {
         $mode    = 'success';
         $success = $result['message'] ?? __('密码已设置成功！', 'aksrt');