Full code refactor to Symfony7.4 with FrankenPHP

Includes significant breaking changes.
Default port and transportation changed to
http via port 80
Names of environment variables have changed.

src/Clock.php

@@ -0,0 +1,19 @@
+<?php
+declare(strict_types=1);
+
+namespace App;
+
+use DateTimeImmutable;
+use Psr\Clock\ClockInterface;
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+
+/* A new Clock should be made for each request,
+ * because a Clock is a snapshot of when the request was made. */
+#[AsAlias(ClockInterface::class)]
+class Clock implements ClockInterface {
+    private DateTimeImmutable $date;
+
+    public function now(): DateTimeImmutable {
+        return new DateTimeImmutable();
+    }
+}