ci: Add GitHub Pages deployment workflow and configure base path

- Add GitHub Actions workflow for automatic deployment to GitHub Pages
- Configure Vite base path for proper GitHub Pages routing
- Set up automated build and deployment on main branch pushes
- Enable concurrent deployment protection and proper permissions

Author: yuis-ice

.github/workflows/deploy.yml

@@ -0,0 +1,53 @@
+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20'
+        cache: 'npm'
+        
+    - name: Install dependencies
+      run: npm ci
+      
+    - name: Build application
+      run: npm run build
+      
+    - name: Setup Pages
+      if: github.ref == 'refs/heads/main'
+      uses: actions/configure-pages@v4
+      
+    - name: Upload artifact
+      if: github.ref == 'refs/heads/main'
+      uses: actions/upload-pages-artifact@v3
+      with:
+        path: './dist'
+        
+    - name: Deploy to GitHub Pages
+      if: github.ref == 'refs/heads/main'
+      id: deployment
+      uses: actions/deploy-pages@v4
+
+# Grant GITHUB_TOKEN the permissions required to make a Pages deployment
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false

vite.config.ts

@@ -3,6 +3,7 @@ import react from '@vitejs/plugin-react'
 
 // https://vite.dev/config/
 export default defineConfig({
+  base: '/prolog-logic-puzzle-solver/',
   plugins: [react()],
   define: {
     global: 'globalThis',