feat(report): route report notices into the in-site message system

Ban appeals already sent site messages to admins and to the appellant,
but reports only produced emails: the submit path never notified admins
in-site and the status change path never notified the reporter. Send a
'report' site message to administrators on submit (deep link to the
ticket list) and to the reporter on status change (status label plus
the admin note), matching the appeal flow's direct-send pattern.
Contract test extended accordingly.

src/Messages/ReportCenter.php

@@ -52,6 +52,7 @@ class ReportCenter {
 
         $id = $wpdb->insert_id ? (int) $wpdb->insert_id : 0;
         if ($id > 0) {
+            $this->notify_admins_new_report($reporter_id, $target_type, $target_id, sanitize_textarea_field($reason));
             do_action('aksrt_report_submitted', $id, [
                 'reporter_id' => $reporter_id,
                 'target_type' => $target_type,
@@ -63,6 +64,50 @@ class ReportCenter {
         return $id;
     }
 
+    /**
+     * 举报提交 → 管理员站内信（与禁封申诉同模式：直达工单列表）。
+     */
+    private function notify_admins_new_report(int $reporter_id, string $target_type, int $target_id, string $reason): void {
+        if (!class_exists('\AKSRT\Messages\Message') || !class_exists('WP_User_Query')) return;
+        $type_labels = ['post' => __('文章', 'aksrt'), 'comment' => __('评论', 'aksrt'), 'user' => __('用户', 'aksrt')];
+        $reporter    = get_userdata($reporter_id);
+        $content     = sprintf(
+            /* translators: 1: reporter name 2: target type 3: target id 4: reason */
+            __('用户 %1$s 举报了%2$s #%3$d：%4$s', 'aksrt'),
+            $reporter instanceof \WP_User ? $reporter->display_name : __('匿名用户', 'aksrt'),
+            $type_labels[$target_type] ?? $target_type,
+            $target_id,
+            mb_substr($reason, 0, 80)
+        );
+        $admins = get_users(['role' => 'administrator', 'fields' => 'ID', 'number' => 20]);
+        foreach ($admins as $admin_id) {
+            Message::get_instance()->send(
+                (int) $admin_id,
+                'report',
+                $content,
+                [
+                    'title'      => __('用户举报', 'aksrt'),
+                    'target_url' => admin_url('users.php?page=aksrt_user_ban&tab=tickets'),
+                ]
+            );
+        }
+    }
+
+    /**
+     * 处理结果 → 举报人站内信（与结果邮件同一时机、同一说明内容）。
+     */
+    private function notify_reporter_status_changed(int $reporter_id, string $new_status, string $note): void {
+        if ($reporter_id <= 0) return;
+        $labels = [
+            'pending'   => __('待处理', 'aksrt'),
+            'reviewing' => __('审核中', 'aksrt'),
+            'resolved'  => __('已解决', 'aksrt'),
+            'dismissed' => __('已驳回', 'aksrt'),
+        ];
+        $content = sprintf(__('您提交的举报已有处理结果：%1$s。%2$s', 'aksrt'), $labels[$new_status] ?? $new_status, $note !== '' ? sprintf(__('处理说明：%s', 'aksrt'), $note) : '');
+        Message::get_instance()->send($reporter_id, 'report', $content, ['title' => __('举报处理结果', 'aksrt')]);
+    }
+
     /**
      * 获取待处理举报数
      */
@@ -155,8 +200,9 @@ class ReportCenter {
 
         $result = $wpdb->update($table, $update_data, ['id' => $report_id], $format, ['%d']);
         if ($result !== false) {
-            // 第 4 参携带处理说明：邮件通知（report_result）需要反馈给举报人。
+            // 第 4 参携带处理说明：邮件通知（report_result）与站内信均需反馈给举报人。
             do_action('aksrt_report_status_changed', $report_id, (int) ($existing->reporter_id ?? 0), $new_status, $note_clean);
+            $this->notify_reporter_status_changed((int) ($existing->reporter_id ?? 0), $new_status, $note_clean);
         }
         return $result !== false;
     }