Convert project to npm/Vite build pipeline

[Copilot]

Replace manually vendored libraries with a proper npm dependency tree and Vite build pipeline. Docker/nginx deployment is preserved for content negotiation support.

Build pipeline

• Added package.json + vite.config.js; npm run dev for local dev, npm run build for production
• npm dependencies: bootstrap, bootstrap-icons, leaflet, n3, proj4, betterknown
• yasgui-graph-plugin (not on npm) stays in vendor/ and is resolved via a @vendor Vite alias in vite.config.js

Source restructure

• src/main.js — Vite entry point; imports all npm CSS/JS + app modules
• src/dereferencer.js, src/map-viewer.js, src/graph-viewer.js — converted to proper ES modules with npm imports
• public/assets/ — static pass-through files (runtime config.js placeholder, prefixes.json, favicon)

Runtime config

window.CONFIG (instead of const CONFIG) is written by entrypoint.sh at container startup, ensuring it's accessible inside ES module scope:

// entrypoint.sh writes at startup:
window.CONFIG = { SPARQL_ENDPOINT: '...', ENTITY_NS: '...', BASE_URI: window.location.origin };

index.html loads config.js as a plain <script> before the Vite bundle so it's available synchronously.

Docker

Dockerfile updated to a multi-stage build: Node 20 Alpine builds via npm ci && npm run build, then dist/ is copied into the nginxinc/nginx-unprivileged:alpine runtime image — no Node.js in the final image.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Convert project to use npm, vite, packages.json</issue_title>
<issue_description>The actual deployment should still be docker based using nginx because of it's possibility to do content negotiation</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Convert project to use npm, vite, packages.json #3

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