feat(ui): move detail page badge next to card number title

app/templates/postcard_detail.html

@@ -5,6 +5,7 @@
     <div class="detail-title-row">
         <a href="/profiles/{{ postcard.profile_id }}/postcards" class="btn btn-back">←</a>
         <h1>{{ postcard.card_number }}</h1>
+        <span class="badge badge-{{ postcard.status }}">{{ {'sent':'已寄出','delivered':'已送达','received':'已收到'}.get(postcard.status, postcard.status) }}</span>
     </div>
     <div class="detail-actions">
         <a href="/postcards/{{ postcard.id }}/edit" class="btn">编辑</a>
@@ -18,7 +19,6 @@
         </form>
     </div>
 </div>
-<span class="badge badge-{{ postcard.status }}">{{ {'sent':'已寄出','delivered':'已送达','received':'已收到'}.get(postcard.status, postcard.status) }}</span>
 <div class="detail-grid">
     <div class="detail-images">
         <div class="image-block">