Root docker-compose.yml: removed build directive so quickstart uses
pre-built image instead of triggering local Rust compilation.
deploy/docker-compose.yml: added Caddy reverse proxy service with
TLS termination, replaced ports with expose (no direct 4000 access),
added healthcheck and service dependency. Removed stale build context
that referenced parent directory.
- Convert registry list, docker detail, package detail, maven detail pages to dark theme
- Use layout_dark instead of layout for all pages
- Update colors: bg-[#1e293b] cards, slate-700 borders, slate-200/400 text
- Mark unused light theme functions with #[allow(dead_code)]