Respect Micropub post-status when creating articles

Articles created via Micropub were always published immediately,
ignoring the client-supplied post-status property. Clients like iA
Writer that publish drafts (post-status: draft) had no way to land
an article as unpublished.

EntryData now extracts post-status from the request, and
ArticleService sets published accordingly, defaulting to true when
the property is omitted or set to anything other than "draft".

Fixes #123

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AXyzNvQZPQgBoSZwW7cLG8

app/Services/ArticleService.php

@@ -13,7 +13,7 @@ class ArticleService
         return Article::create([
             'title' => $data['name'],
             'main' => $data['content'],
-            'published' => true,
+            'published' => ($data['post-status'] ?? null) !== 'draft',
         ]);
     }
 }