feat(dump): list dumps stored in the plugin filesystem

src/Struct/DumpFile.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace AeonDumpManager\Struct;
+
+/**
+ * A dump on disk. Not a DAL entity — dumps are plain files in the plugin's
+ * private Flysystem mount, identified by their filename.
+ */
+final class DumpFile
+{
+    public function __construct(
+        public readonly string $filename,
+        public readonly \DateTimeImmutable $datetime,
+        public readonly int $sizeBytes,
+    ) {
+    }
+
+    /**
+     * @return array{filename: string, datetime: string, sizeBytes: int}
+     */
+    public function jsonSerialize(): array
+    {
+        return [
+            'filename' => $this->filename,
+            'datetime' => $this->datetime->format(DATE_ATOM),
+            'sizeBytes' => $this->sizeBytes,
+        ];
+    }
+}