feat: add Docker deployment (Dockerfile, compose, Caddyfile)
Multi-stage Dockerfile builds SvelteKit then runs a lean production image. docker-compose.yml wires up MariaDB with health checks, the app, and Caddy for TLS termination. Caddyfile uses SITE_DOMAIN env var with localhost fallback. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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