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.

package.json

@@ -30,6 +30,7 @@
     "@angular/build": "~21.1.0",
     "@angular/cli": "~21.1.0",
     "@angular/compiler-cli": "~21.1.0",
+    "@lhci/cli": "~0.15.1",
     "@types/jasmine": "~5.1.15",
     "angular-eslint": "21.2.0",
     "eslint": "^9.39.2",