Replace static Hello World with KenJim Technologies React app

- Vite + React frontend: hero, services grid, contact form
- Express + nodemailer backend for contact form → kenji@kenjim.com
- Multi-stage Docker builds; nginx inside frontend proxies /api to backend
- SMTP config via .env (see .env.example)

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

frontend/Dockerfile

@@ -0,0 +1,11 @@
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package.json .
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80