Harden Docker packaging and bundle frontend assets locally

- replace fragile Docker file bind mount with persistent /data storage
- add container entrypoint to link config.json from persistent storage
- tighten Docker image permissions and add a basic healthcheck
- add .dockerignore to keep git metadata and runtime files out of the image
- bundle hls.js locally instead of loading it from a CDN
- download and serve UI/theme fonts locally instead of Google Fonts
- update service worker cache entries for local assets
- refresh README to reflect local bundled assets and cleaner deployment docs

assets/fonts/fonts.css

@@ -0,0 +1,87 @@
+@font-face {
+  font-family: 'Barlow Condensed';
+  font-style: normal;
+  font-weight: 300;
+  font-display: swap;
+  src: url('/assets/fonts/barlow-condensed-300.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Barlow Condensed';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('/assets/fonts/barlow-condensed-400.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Barlow Condensed';
+  font-style: normal;
+  font-weight: 600;
+  font-display: swap;
+  src: url('/assets/fonts/barlow-condensed-600.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Barlow Condensed';
+  font-style: normal;
+  font-weight: 700;
+  font-display: swap;
+  src: url('/assets/fonts/barlow-condensed-700.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Share Tech Mono';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('/assets/fonts/share-tech-mono-400.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Rajdhani';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('/assets/fonts/rajdhani-400.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Rajdhani';
+  font-style: normal;
+  font-weight: 600;
+  font-display: swap;
+  src: url('/assets/fonts/rajdhani-600.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Rajdhani';
+  font-style: normal;
+  font-weight: 700;
+  font-display: swap;
+  src: url('/assets/fonts/rajdhani-700.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'IM Fell English';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('/assets/fonts/im-fell-english-400.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'IM Fell English';
+  font-style: italic;
+  font-weight: 400;
+  font-display: swap;
+  src: url('/assets/fonts/im-fell-english-400-italic.ttf') format('truetype');
+}
+
+@font-face {
+  font-family: 'Special Elite';
+  font-style: normal;
+  font-weight: 400;
+  font-display: swap;
+  src: url('/assets/fonts/special-elite-400.ttf') format('truetype');
+}