Bind-mount the project into the container for live edits

docker-compose.yml now mounts the working directory at /var/www/html so
PHP changes take effect without an image rebuild. To avoid a mount nested
inside that bind mount, the storage directory moves out to /var/www/storage
(still a named volume). Config gains a STORAGE_PATH env var driving both the
SQLite database and the JWT signing-key location; the entrypoint chowns that
directory. The Dockerfile is unchanged and still builds a self-contained
image (STORAGE_PATH defaults back to ./storage when unset).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/Support/Config.php

@@ -24,7 +24,7 @@ final class Config
             \Dotenv\Dotenv::createImmutable($basePath)->safeLoad();
         }
 
-        $storagePath = $basePath . '/storage';
+        $storagePath = self::env('STORAGE_PATH', $basePath . '/storage');
         if (!is_dir($storagePath)) {
             mkdir($storagePath, 0775, true);
         }