fix: switch from SQLite to MariaDB for production

Database now uses native MariaDB (lthn_io database). Container
connects via host.docker.internal:3306. Claims persisted in proper
RDBMS that survives container rebuilds.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.yml

@@ -18,8 +18,12 @@ services:
       OCTANE_SERVER: frankenphp
       CACHE_STORE: file
       SESSION_DRIVER: file
-      DB_CONNECTION: sqlite
-      DB_DATABASE: /app/database/database.sqlite
+      DB_CONNECTION: mariadb
+      DB_HOST: host.docker.internal
+      DB_PORT: 3306
+      DB_DATABASE: lthn_io
+      DB_USERNAME: claude
+      DB_PASSWORD: claude
     extra_hosts:
       - "host.docker.internal:host-gateway"
     volumes: