feat: 前台 paywall——整篇锁定渲染付费墙，付费块替换为 teaser

- membership/post.rendered 过滤：整篇锁定（members_only）渲染 paywall 视图（封面+标题+价格+单篇解锁/开通会员按钮，游客引导登录）；[paid] 块替换为带解锁按钮的 teaser；替换改用 preg_replace_callback 避免 $ 转义问题
- 视图放 resources/views/membership/（主题同名文件可覆盖），两主题补充 .paywall/.paid-teaser 样式
- 修复泄漏：excerpt_or_fallback 对 members_only 文章不再回退截取正文，防止内容泄漏到 paywall 与 SEO meta
- 测试：更新 teaser 断言，新增 guest 见 paywall、登录用户见解锁/会员按钮

app/Models/Post.php

@@ -126,6 +126,11 @@ class Post extends Model implements HasMedia
             return $this->excerpt;
         }
 
+        // 会员专享文章不落入内容摘要，避免泄漏到 paywall/SEO meta
+        if (! empty(($this->meta ?? [])['members_only'])) {
+            return '';
+        }
+
         $text = strip_tags($this->content);
         // 付费块不进入摘要，避免付费内容泄漏到列表页/SEO meta
         $text = preg_replace('/\[paid\].*?\[\/paid\]/s', '', $text);

plugins/neatstudio.membership/src/ServiceProvider.php

@@ -53,21 +53,21 @@ class ServiceProvider extends PluginServiceProvider
             }
         }, 10);
 
-        // 付费文章：[paid]...[/paid] 对无权限访客隐藏
+        // 付费文章：[paid]...[/paid] 对无权限访客隐藏为 teaser；整篇锁定渲染 paywall
         $manager->addFilter('post.rendered', function (string $html, \App\Models\Post $post) {
             $service = app(Services\MembershipService::class);
             $user = auth()->user();
 
             if (preg_match('/\[paid\](.*?)\[\/paid\]/s', $html) && ! $service->canReadPaidContent($user, $post)) {
-                $html = preg_replace(
+                $html = preg_replace_callback(
                     '/\[paid\](.*?)\[\/paid\]/s',
-                    '<div class="paid-teaser">（付费内容已隐藏，开通会员或单篇解锁后可见）</div>',
+                    fn () => view('membership.paid-teaser', ['post' => $post])->render(),
                     $html
                 );
             }
 
             if (! $service->canReadPost($user, $post)) {
-                return '<div class="paid-teaser">（本文章为会员专享，开通会员后可见）</div>';
+                return view('membership.paywall', ['post' => $post])->render();
             }
 
             return $html;

resources/views/membership/paid-teaser.blade.php

@@ -0,0 +1,19 @@
+@php
+    $price = (int) ($post->meta['price'] ?? 0);
+@endphp
+
+<div class="paid-teaser" role="note" aria-label="付费内容">
+    <span>本文包含付费内容</span>
+    @auth
+        @if($price > 0)
+            <form action="{{ route('posts.unlock', $post) }}" method="post" style="display:inline">
+                @csrf
+                <button type="submit" class="btn btn-primary">单篇解锁 ¥{{ number_format($price / 100, 2) }}</button>
+            </form>
+        @else
+            <a href="{{ route('membership.index') }}" class="btn btn-primary">开通会员</a>
+        @endif
+    @else
+        <a href="{{ route('login') }}" class="btn btn-primary">登录后查看</a>
+    @endauth
+</div>

resources/views/membership/paywall.blade.php

@@ -0,0 +1,52 @@
+@php
+    $service = app(\Plugins\Neatstudio\Membership\Services\MembershipService::class);
+    $user = auth()->user();
+    $isMember = $user && $service->isMember($user);
+    $price = (int) ($post->meta['price'] ?? 0);
+    $plansExist = \Plugins\Neatstudio\Membership\Models\MembershipPlan::query()->where('active', true)->exists();
+@endphp
+
+<div class="paywall" role="note" aria-label="付费内容">
+    @if($cover = $post->getFirstMedia('cover'))
+        <div class="paywall-cover">
+            <img src="{{ $cover->getUrl('card') ?: $cover->getUrl() }}" alt="{{ $post->title }}">
+        </div>
+    @endif
+
+    <div class="paywall-body">
+        <h2 class="paywall-title">{{ $post->title }}</h2>
+        @if($post->excerpt_or_fallback)
+            <p class="paywall-excerpt">{{ $post->excerpt_or_fallback }}</p>
+        @endif
+
+        @if($price > 0)
+            <p class="paywall-price">单篇解锁 ¥{{ number_format($price / 100, 2) }}</p>
+        @endif
+
+        <p class="paywall-hint">
+            @if($isMember)
+                你是会员，本文可直接阅读。
+            @else
+                本文为{{ $price > 0 ? '付费内容' : '会员专享内容' }}，解锁或开通会员后可阅读全文。
+            @endif
+        </p>
+
+        <div class="paywall-actions">
+            @auth
+                @if(! $isMember)
+                    @if($price > 0)
+                        <form action="{{ route('posts.unlock', $post) }}" method="post" style="display:inline">
+                            @csrf
+                            <button type="submit" class="btn btn-primary">单篇解锁</button>
+                        </form>
+                    @endif
+                    @if($plansExist)
+                        <a href="{{ route('membership.index') }}" class="btn">开通会员</a>
+                    @endif
+                @endif
+            @else
+                <a href="{{ route('login') }}" class="btn btn-primary">登录后解锁</a>
+            @endauth
+        </div>
+    </div>
+</div>

tests/Feature/MembershipFlowTest.php

@@ -87,11 +87,12 @@ class MembershipFlowTest extends TestCase
             'published_at' => now(),
         ]);
 
-        // 游客：付费部分被替换
+        // 游客：付费部分被替换为 teaser
         $this->get('/posts/paid-post.shtml')
             ->assertOk()
             ->assertDontSee('付费隐藏内容')
-            ->assertSee('付费内容已隐藏');
+            ->assertSee('本文包含付费内容')
+            ->assertSee('登录后查看');
 
         // 会员：可见
         $this->actingAs($this->user)->post('/membership/'.$this->plan->id.'/subscribe');
@@ -184,4 +185,43 @@ class MembershipFlowTest extends TestCase
 
         $this->assertSame(0, Payment::query()->count());
     }
+
+    public function test_members_only_post_shows_paywall_to_guest(): void
+    {
+        $post = Post::create([
+            'title' => '会员专享文章',
+            'slug' => 'members-only-post',
+            'content' => '这是会员才能看到的正文内容',
+            'content_format' => 'markdown',
+            'status' => 'published',
+            'published_at' => now(),
+            'meta' => ['members_only' => true, 'price' => 500],
+        ]);
+
+        $this->get('/posts/members-only-post.shtml')
+            ->assertOk()
+            ->assertSee('登录后解锁')
+            ->assertSee('单篇解锁')
+            ->assertSee('会员专享文章')
+            ->assertDontSee('这是会员才能看到的正文内容');
+    }
+
+    public function test_members_only_post_paywall_shows_unlock_buttons_to_user(): void
+    {
+        $post = Post::create([
+            'title' => '会员专享文章2',
+            'slug' => 'members-only-post-2',
+            'content' => '正文内容不可见',
+            'content_format' => 'markdown',
+            'status' => 'published',
+            'published_at' => now(),
+            'meta' => ['members_only' => true, 'price' => 9900],
+        ]);
+
+        $this->actingAs($this->user)->get('/posts/members-only-post-2.shtml')
+            ->assertOk()
+            ->assertSee('单篇解锁')
+            ->assertSee('开通会员')
+            ->assertDontSee('正文内容不可见');
+    }
 }

themes/modern/assets/style.css

@@ -170,3 +170,14 @@ a:hover { opacity: 0.8; }
 .toc-level-4, .toc-level-5, .toc-level-6 { padding-left: 28px; }
 
 .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
+
+/* Paywall */
+.paywall { border: 1px solid var(--border); border-radius: 12px; padding: 28px 22px; background: var(--bg); text-align: center; }
+.paywall-cover img { max-width: 100%; border-radius: 10px; margin-bottom: 16px; }
+.paywall-title { font-size: 22px; margin: 0 0 10px; }
+.paywall-excerpt { color: var(--muted); font-size: 14px; margin: 0 0 16px; }
+.paywall-price { font-size: 24px; font-weight: 800; color: var(--accent); margin: 0 0 8px; }
+.paywall-hint { color: var(--muted); font-size: 13px; margin: 0 0 18px; }
+.paywall-actions .btn { margin: 0 6px; }
+.paid-teaser { border: 1px dashed var(--border); background: var(--bg-muted, #f6f6f6); color: var(--muted); border-radius: 10px; padding: 14px 16px; margin: 14px 0; font-size: 14px; }
+.paid-teaser .btn { margin-left: 8px; }

themes/sablog/assets/style.css

@@ -144,3 +144,14 @@ a:hover { color: #f60; text-decoration: underline; }
 .toc-level-4, .toc-level-5, .toc-level-6 { padding-left: 28px; }
 
 .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
+
+/* Paywall */
+.paywall { border: 1px solid #e0e0e0; border-radius: 8px; padding: 24px 20px; background: #fafafa; text-align: center; }
+.paywall-cover img { max-width: 100%; border-radius: 6px; margin-bottom: 14px; }
+.paywall-title { font-size: 20px; margin: 0 0 10px; }
+.paywall-excerpt { color: #666; font-size: 14px; margin: 0 0 14px; }
+.paywall-price { font-size: 22px; font-weight: 800; color: #f60; margin: 0 0 8px; }
+.paywall-hint { color: #888; font-size: 13px; margin: 0 0 16px; }
+.paywall-actions .btn { margin: 0 6px; }
+.paid-teaser { border: 1px dashed #f5c6cb; background: #fdecea; color: #c62828; border-radius: 6px; padding: 12px 14px; margin: 12px 0; font-size: 14px; }
+.paid-teaser .btn { margin-left: 8px; }