Add settings-driven theme and version metadata

api/migrations/Version20251224194000.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace DoctrineMigrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20251224194000 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return 'Add accent color setting.';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql("INSERT IGNORE INTO settings (`key`, value) VALUES ('accent_color', '#f29b3f')");
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql("DELETE FROM settings WHERE `key` = 'accent_color'");
+    }
+}