feat: use xpier media library for uploads and markdown embeds

Store media:ID in post bodies instead of CDN URLs, and keep sablog attach tokens as a fallback.

Co-authored-by: Cursor <cursoragent@cursor.com>

resources/views/list.blade.php

@@ -9,10 +9,10 @@
     <main class="content">
         <h1 class="list-title">{{ $archiveTitle ?? ($category->name ?? '文章列表') }}</h1>
 
-    @if(isset($category) && ($category->description || $category->getFirstMedia('cover')))
+    @if(isset($category) && ($category->description || $category->coverImageUrl()))
         <div class="category-intro">
-            @if($cover = $category->getFirstMedia('cover'))
-                <img src="{{ $cover->getUrl() }}" alt="{{ $category->name }}" class="category-cover">
+            @if($url = $category->coverImageUrl())
+                <img src="{{ $url }}" alt="{{ $category->name }}" class="category-cover">
             @endif
             <div>
                 @if($category->description)

resources/views/membership/paywall.blade.php

@@ -7,9 +7,9 @@
 @endphp
 
 <div class="paywall" role="note" aria-label="付费内容">
-    @if($cover = $post->getFirstMedia('cover'))
+    @if($url = $post->coverImageUrl())
         <div class="paywall-cover">
-            <img src="{{ $cover->getUrl('card') ?: $cover->getUrl() }}" alt="{{ $post->title }}">
+            <img src="{{ $url }}" alt="{{ $post->title }}">
         </div>
     @endif
 

resources/views/partials/post-card.blade.php

@@ -1,7 +1,7 @@
 <article class="post-card {{ $post->is_sticky ? 'sticky' : '' }}">
-    @if($cover = $post->getFirstMedia('cover'))
+@if($url = $post->coverImageUrl())
         <a href="{{ route('posts.show', $post->slug ?: $post->id) }}" class="post-cover">
-            <img src="{{ $cover->getUrl('card') ?: $cover->getUrl() }}" alt="{{ $post->title }}" loading="lazy">
+            <img src="{{ $url }}" alt="{{ $post->title }}" loading="lazy">
         </a>
     @endif
     <h2 class="post-title">

resources/views/show.blade.php

@@ -30,9 +30,9 @@
                     </details>
                 </nav>
             @endif
-            @if($cover = $post->getFirstMedia('cover'))
+            @if($url = $post->coverImageUrl())
                 <div class="post-cover">
-                    <img src="{{ $cover->getUrl('card') ?: $cover->getUrl() }}" alt="{{ $post->title }}">
+                    <img src="{{ $url }}" alt="{{ $post->title }}">
                 </div>
             @endif
             <h1 class="post-title">{{ $post->title }}</h1>