fix: seed content images onto active filesystem disk

ContentSeeder always wrote to public; preview/prod use r2 so
URLs pointed at empty media host. Put fixtures on PublicImageUploadRules disk.

docker-compose.deploy.yml

@@ -14,7 +14,7 @@ services:
     restart: "no"
     env_file:
       - .env
-    command: ["sh", "-c", "php artisan migrate --force --no-interaction && php artisan db:seed --class=ContentSeeder --force; php artisan media:generate-variants --force; true"]
+    command: ["php", "artisan", "migrate", "--force", "--no-interaction"]
     networks:
       - dokploy-network