Migrate from Create React App to Vite

CRA (react-scripts 5.0.1) is abandoned and incompatible with TypeScript 5.x.
Vite provides faster builds, active maintenance, and native TS5 support.

- Replace react-scripts with vite + @vitejs/plugin-react
- Move index.html to root with script module entry point
- Replace setupProxy.js with vite.config.ts proxy config
- Rename env vars from REACT_APP_ to VITE_ prefix
- Update tsconfig for bundler module resolution
- Add nginx setup script for deployment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

setup-nginx.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# Create nginx config for dashboard.tools.hihala.com
+sudo tee /etc/nginx/sites-available/dashboard.tools.hihala.com > /dev/null <<'EOF'
+server {
+    listen 80;
+    listen [::]:80;
+    server_name dashboard.tools.hihala.com;
+
+    location /.well-known/acme-challenge/ {
+        root /var/www/html;
+    }
+
+    location / {
+        proxy_pass http://127.0.0.1:3001;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}
+EOF
+
+sudo ln -sf /etc/nginx/sites-available/dashboard.tools.hihala.com /etc/nginx/sites-enabled/
+sudo nginx -t && sudo systemctl reload nginx
+
+# Test ACME challenge path
+sudo mkdir -p /var/www/html/.well-known/acme-challenge/
+echo "test" | sudo tee /var/www/html/.well-known/acme-challenge/test
+curl -s http://dashboard.tools.hihala.com/.well-known/acme-challenge/test && echo " - OK"
+rm -f /var/www/html/.well-known/acme-challenge/test
+
+# Run certbot
+sudo certbot --nginx -d dashboard.tools.hihala.com