feat(admin): 订阅列表支持一键绑定到订单（续费缺订阅治理）

resources/views/admin/site_subscriptions/index.blade.php

@@ -39,6 +39,12 @@
     $incomingBack = (string) request()->query('back', '');
     $safeBackForLinks = \App\Support\BackUrl::sanitizeForLinks($incomingBack);
 
+    // “从订单详情页来挑订阅”的治理交互：
+    // - attach_order_id：表示把选中的订阅绑定回某个订单
+    // - attach_back：绑定成功后回跳到哪里（通常是订单详情页）
+    $attachOrderId = (int) request()->query('attach_order_id', 0);
+    $safeAttachBackForLinks = \App\Support\BackUrl::sanitizeForLinks((string) request()->query('attach_back', ''));
+
     // 用于摘要卡等入口：保留当前 query 并覆盖字段，同时安全透传 back。
     $safeFullUrlWithQuery = function (array $overrides = []) use ($safeBackForLinks) {
         return \App\Support\BackUrl::currentPathWithQuery($overrides, $safeBackForLinks);
@@ -300,6 +306,25 @@
                     <div class="mt-4 actions gap-10">
                         <a class="btn btn-secondary btn-sm" href="{!! $renewOrderUrl !!}">续费下单</a>
 
+                        @if($attachOrderId > 0)
+                            @php
+                                // 从订单详情进入订阅管理页时：提供“绑定到该订单”的治理按钮
+                                // 注意：提交后由 attachSubscription 做强校验（续费单 + merchant/plan 一致）
+                                $attachBack = $safeAttachBackForLinks !== '' ? $safeAttachBackForLinks : $safeBackForLinks;
+                                if ($attachBack === '') {
+                                    $attachBack = $back;
+                                }
+                            @endphp
+                            <form method="post" action="/admin/platform-orders/{{ $attachOrderId }}/attach-subscription" class="inline-form" onsubmit="return confirm('确认将该订阅绑定到目标订单？');">
+                                @csrf
+                                <input type="hidden" name="site_subscription_id" value="{{ $subscription->id }}">
+                                @if($attachBack !== '')
+                                    <input type="hidden" name="back" value="{!! $attachBack !!}">
+                                @endif
+                                <button type="submit" class="btn btn-primary btn-sm">绑定到订单 #{{ $attachOrderId }}</button>
+                            </form>
+                        @endif
+
                         <form method="post" action="/admin/site-subscriptions/{{ $subscription->id }}/set-status">
                             @csrf
                             <select name="status" onchange="this.form.submit()" class="w-140">