Track original artwork file availability more accurately.

Resolve local and object-storage originals, persist download status, and audit missing files without guessing from a single path.

database/migrations/2026_09_05_000001_add_download_availability_to_artworks_table.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void
+    {
+        Schema::table('artworks', function (Blueprint $table): void {
+            $table->string('download_status', 16)->default('unknown')->after('file_path');
+            $table->string('download_source', 16)->nullable()->after('download_status');
+            $table->timestamp('download_checked_at')->nullable()->after('download_source');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('artworks', function (Blueprint $table): void {
+            $table->dropColumn(['download_status', 'download_source', 'download_checked_at']);
+        });
+    }
+};