ci: integrate lhci pipeline gates for performance and accessibility

.github/workflows/lhci.yml

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+name: UI Audit & Quality Assurance Gates
+
+on:
+  push:
+    branches: [ main, dev ]
+  pull_request:
+    branches: [ main, dev ]
+
+jobs:
+  lighthouse-audit:
+    name: Run Performance & Accessibility Gateways
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout Source Code Repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js Runtime Environment
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+
+      - name: Install Application Dependencies
+        run: npm ci
+
+      # Compile production build assets
+      - name: Compile Production Application Build
+        run: npm run build
+        env:
+          NEXT_PUBLIC_DISABLE_ANALYTICS: true
+
+      # Orchestrate background server lifecycle and run Lighthouse CI
+      - name: Run Lighthouse Audit Assertions Matrix
+        run: |
+          npx start-server-and-test \
+            'npm run start' \
+            http://127.0.0.1:3000 \
+            'npx @lhci/cli@0.13.x autorun'

lighthouserc.js

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+module.exports = {
+  ci: {
+    collect: {
+      // Build directory location where the production app compiles
+      staticDistDir: './out', 
+      numberOfRuns: 3,
+    },
+    assert: {
+      // Enforce zero tolerance for regression dropping below target parameters
+      assertions: {
+        'categories:performance': ['error', { minScore: 0.85 }],
+        'categories:accessibility': ['error', { minScore: 0.95 }],
+        'categories:best-practices': ['error', { minScore: 0.90 }],
+        'categories:seo': ['off'], // Can be tuned to 'warn' or 'error' if needed later
+      },
+    },
+    upload: {
+      target: 'temporary-public-storage', // Saves HTML trace artifact summaries for review on failure
+    },
+  },
+};