Add frontend Dockerfile

frontend/Dockerfile

@@ -0,0 +1,38 @@
+# ─── SmartClass Frontend ─────────────────────────────────────────────
+# Stage 1: Build React app
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Install dependencies
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Build argument for API URL (baked into build)
+ARG VITE_API_URL=http://localhost:8000
+ENV VITE_API_URL=${VITE_API_URL}
+
+# Copy source and build
+COPY . .
+RUN npm run build
+
+# Stage 2: Serve with nginx
+FROM nginx:alpine AS production
+
+LABEL maintainer="SmartClass Team"
+LABEL description="SmartClass Frontend - React + Nginx"
+
+# Custom nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Copy built app from builder stage
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Expose port 80
+EXPOSE 80
+
+# Health check
+HEALTHCHECK --interval=15s --timeout=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://127.0.0.1:80/ || exit 1
+
+CMD ["nginx", "-g", "daemon off;"]