Fix Fizzy MariaDB root password environment variable

Changed MARIADB_ROOT_PASSWORD from $SERVICE_PASSWORD_MARIADB_ROOT
to $SERVICE_PASSWORD_ROOT to match Coolify's standard naming convention
for root passwords. This fixes the MariaDB initialization error.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

templates/compose/fizzy.yaml

@@ -36,7 +36,7 @@ services:
       - MARIADB_DATABASE=fizzy
       - MARIADB_USER=$SERVICE_USER_MARIADB
       - MARIADB_PASSWORD=$SERVICE_PASSWORD_MARIADB
-      - MARIADB_ROOT_PASSWORD=$SERVICE_PASSWORD_MARIADB_ROOT
+      - MARIADB_ROOT_PASSWORD=$SERVICE_PASSWORD_ROOT
     volumes:
       - mariadb-data:/var/lib/mysql
     healthcheck: