feat: draw Reigen Arataka with Three.js and multi-shot camera

Procedural head, face and slicked-back hair rendered with Three.js
primitives, seven switchable camera shots, orbit controls and auto-rotate.
Add GitHub Pages deploy workflow.

.github/workflows/deploy-pages.yml

@@ -0,0 +1,39 @@
+name: Deploy to GitHub Pages
+
+# Publishes the static site (repo root) to GitHub Pages on every push to main.
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow one concurrent deployment; newer pushes cancel in-progress runs.
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload site artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: .
+
+      - name: Deploy
+        id: deployment
+        uses: actions/deploy-pages@v4