refactor(classes): organize inc/classes into domain folders

Move ~94 root class shells and root *-traits into domain directories
(core, auth, user, credits, content, payment/gateways, forum, shop,
sms, ai, messages, extensions, widgets, settings, admin). Update
bootstrap require paths, co-locate traits with owners, fix forum/user
relative requires, drop duplicate shop controller requires, and wire
home-modules load. Path-only; class names and init order unchanged.

inc/classes/sms/class-aksrt-sms-signature-helper.php

@@ -0,0 +1,87 @@
+<?php
+/**
+ * AKSRT SMS Signature Helper — 阿里云 API 签名助手
+ *
+ * 对齐 zibll 的 SignatureHelper 实现：POST 方式 + HMAC-SHA1 签名。
+ *
+ * @package AKSRT
+ * @link    https://help.aliyun.com/document_detail/31426.html
+ */
+
+defined('ABSPATH') || exit;
+
+class AKSRT_SMS_Signature_Helper {
+
+    /**
+     * 生成签名并发起请求
+     *
+     * @param string $accessKeyId     AccessKeyId
+     * @param string $accessKeySecret AccessKeySecret
+     * @param string $domain          API 域名
+     * @param array  $params          API 参数
+     * @param bool   $https           是否使用 HTTPS
+     * @return array|WP_Error
+     */
+    public function request(string $accessKeyId, string $accessKeySecret, string $domain, array $params, bool $https = true) {
+        $apiParams = array_merge([
+            'SignatureMethod'  => 'HMAC-SHA1',
+            'SignatureNonce'   => uniqid((string) mt_rand(0, 0xffff), true),
+            'SignatureVersion' => '1.0',
+            'AccessKeyId'      => $accessKeyId,
+            'Timestamp'        => gmdate('Y-m-d\TH:i:s\Z'),
+            'Format'           => 'JSON',
+        ], $params);
+
+        ksort($apiParams);
+
+        $sortedQueryString = '';
+        foreach ($apiParams as $key => $value) {
+            $sortedQueryString .= '&' . $this->encode($key) . '=' . $this->encode((string) $value);
+        }
+
+        $stringToSign = 'POST&%2F&' . $this->encode(substr($sortedQueryString, 1));
+        $sign = base64_encode(hash_hmac('sha1', $stringToSign, $accessKeySecret . '&', true));
+        $signature = $this->encode($sign);
+
+        $url = ($https ? 'https' : 'http') . "://{$domain}/";
+        $body = "Signature={$signature}{$sortedQueryString}";
+
+        return $this->fetchContent($url, $body);
+    }
+
+    /**
+     * URL 编码（对齐阿里云规范）
+     */
+    private function encode(string $str): string {
+        $res = rawurlencode($str);
+        $res = str_replace('+', '%20', $res);
+        $res = str_replace('*', '%2A', $res);
+        $res = str_replace('%7E', '~', $res);
+        return $res;
+    }
+
+    /**
+     * 发送 HTTP POST 请求
+     *
+     * @return array|WP_Error
+     */
+    private function fetchContent(string $url, string $body) {
+        $response = wp_remote_post($url, [
+            'timeout' => 10,
+            'headers' => [
+                'Content-Type'  => 'application/x-www-form-urlencoded',
+                'x-sdk-client'  => 'php/2.0.0',
+            ],
+            'body'    => $body,
+        ]);
+
+        if (is_wp_error($response)) {
+            return $response;
+        }
+
+        $content = wp_remote_retrieve_body($response);
+        $decoded = json_decode($content, true);
+
+        return is_array($decoded) ? $decoded : ['raw' => $content];
+    }
+}