Add GitHub Pages deployment workflow

Author: massif-01

.github/workflows/deploy-gh-pages.yml

@@ -0,0 +1,41 @@
+# Deploy ChatRaw static frontend to GitHub Pages (interface showcase only, no backend/chat)
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:  # Allow manual trigger
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+
+      - name: Prepare artifact
+        run: |
+          mkdir -p deploy
+          cp -r backend/static/* deploy/
+          touch deploy/.nojekyll
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: deploy
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4