Add Lighthouse CI and expand frontend CI/CD

Replace the previous frontend workflow with an expanded Build, Test & Push workflow. Adds a quality-check job (runs on push and PRs to main) that sets up Node.js, installs deps, runs lint/type checks, unit tests (ChromeHeadless), production build and runs LHCI. The docker job now depends on the quality-check job and only runs on pushes to main. Added lighthouserc.json and ignored .lighthouseci, relaxed two ESLint rules (@typescript-eslint/no-inferrable-types and no-explicit-any), and updated package.json (and lock) to include LHCI tooling.

eslint.config.js

@@ -15,6 +15,8 @@ module.exports = defineConfig([
     ],
     processor: angular.processInlineTemplates,
     rules: {
+      "@typescript-eslint/no-inferrable-types": "off",
+      "@typescript-eslint/no-explicit-any": "off",
       "@angular-eslint/directive-selector": [
         "error",
         {