chore(build): remove obsolete downloaded JS bundles and update Dockerfile

Remove minified JavaScript libraries that were previously downloaded during
postinstall (htmx.min.js, highlight.min.js, lunr.min.js, lunr-flex.min.js).
These are now bundled via esbuild from npm packages.

Update Dockerfile to remove the now-unnecessary postinstall npm script execution,
streamlining the container build process.

Dockerfile

@@ -30,7 +30,6 @@ RUN cd templates && templ generate
 
 # Build frontend assets (only these rebuild on web/ changes)
 RUN npm run build:css:prod
-RUN npm run postinstall
 RUN npm run build:ts
 
 # Build Go binary (cached unless Go files or generated code changes)

web/static/lunr-flex.min.js

@@ -1 +0,0 @@
-Failed to fetch version info for lunr-flex.