fix: generate settings.min.js for production sites without SCRIPT_DEBUG

WordPress loads settings.min.js instead of settings.js when SCRIPT_DEBUG
is false (the default on production sites). The old settings.min.js from
the original plugin was still present and caused a crash because it
referenced licence.is_set which could be undefined.

- Add @rollup/plugin-terser to build dependencies
- Update rollup.config.mjs to output both settings.js (dev) and
  settings.min.js (prod, minified) from the same source
- Rebuild both outputs with all licence-removal changes included

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -9,6 +9,7 @@
   "devDependencies": {
     "@rollup/plugin-commonjs": "^25.0.0",
     "@rollup/plugin-node-resolve": "^15.0.0",
+    "@rollup/plugin-terser": "^0.4.4",
     "rollup": "^3.29.4",
     "rollup-plugin-css-only": "^4.5.0",
     "rollup-plugin-svelte": "^7.1.6",