feat: add complete Docker setup for testing

- Update docker-compose.yml with frontend service and healthchecks

- Add frontend Dockerfile with dev and production stages

- Add nginx.conf for production frontend serving

- Add docker-compose.prod.yml for production deployment

- Add .env.example with all configuration options

- Add init scripts (init.sh, init.ps1) for easy setup

frontend/Dockerfile

@@ -0,0 +1,45 @@
+# ── Development Stage ──────────────────────────────────────────────────────
+FROM node:20-alpine AS development
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy source code
+COPY . .
+
+# Expose Vite dev server port
+EXPOSE 5173
+
+# Start dev server with host binding for Docker
+CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0"]
+
+
+# ── Build Stage ────────────────────────────────────────────────────────────
+FROM node:20-alpine AS build
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+
+# ── Production Stage ───────────────────────────────────────────────────────
+FROM nginx:alpine AS production
+
+# Copy built files to nginx
+COPY --from=build /app/dist /usr/share/nginx/html
+
+# Copy nginx config for SPA routing
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]