feat(dump): parse dump filenames and detect MySQL variant

src/Service/DumpFilenameParser.php

@@ -0,0 +1,37 @@
+<?php declare(strict_types=1);
+
+namespace AeonDumpManager\Service;
+
+/**
+ * Dumps are named dump_YYYY-MM-DD_HH-mm-ss.sql.gz — lexicographically sortable,
+ * and the filename is the single source of truth for a dump's datetime (not
+ * filesystem mtime, which can drift across copies/touches).
+ */
+class DumpFilenameParser
+{
+    private const PATTERN = '/^dump_(\d{4}-\d{2}-\d{2})_(\d{2}-\d{2}-\d{2})\.sql\.gz$/';
+
+    public function format(\DateTimeImmutable $dateTime): string
+    {
+        return 'dump_' . $dateTime->format('Y-m-d_H-i-s') . '.sql.gz';
+    }
+
+    public function parse(string $filename): ?\DateTimeImmutable
+    {
+        if (preg_match(self::PATTERN, $filename, $matches) !== 1) {
+            return null;
+        }
+
+        $dateTime = \DateTimeImmutable::createFromFormat(
+            'Y-m-d_H-i-s',
+            $matches[1] . '_' . $matches[2]
+        );
+
+        return $dateTime ?: null;
+    }
+
+    public function isValid(string $filename): bool
+    {
+        return $this->parse($filename) !== null;
+    }
+}

src/Service/MySqlVariant.php

@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace AeonDumpManager\Service;
+
+/**
+ * Pure version-string check, split out of DumpBinaryLocator so it's
+ * unit-testable without a live Shopware kernel/DB connection. Mirrors
+ * Doctrine DBAL's own AbstractMySQLDriver::createDatabasePlatformForVersion()
+ * check — the stable, version-portable way to tell MariaDB from MySQL.
+ */
+class MySqlVariant
+{
+    public static function isMariaDb(string $serverVersion): bool
+    {
+        return stripos($serverVersion, 'mariadb') !== false;
+    }
+}