Add Lighthouse CI config with >=95 thresholds across 4 categories

lighthouserc.cjs

@@ -0,0 +1,28 @@
+module.exports = {
+  ci: {
+    collect: {
+      staticDistDir: './dist',
+      url: [
+        'http://localhost/index.html',
+        'http://localhost/pricing/index.html',
+        'http://localhost/imprint/index.html',
+        'http://localhost/privacy/index.html',
+      ],
+      numberOfRuns: 1,
+      settings: {
+        preset: 'desktop',
+      },
+    },
+    assert: {
+      assertions: {
+        'categories:performance': ['error', { minScore: 0.95 }],
+        'categories:accessibility': ['error', { minScore: 0.95 }],
+        'categories:best-practices': ['error', { minScore: 0.95 }],
+        'categories:seo': ['error', { minScore: 0.95 }],
+      },
+    },
+    upload: {
+      target: 'temporary-public-storage',
+    },
+  },
+};