🐳 Update Dockerfile

Dockerfile

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+# Multi-stage Dockerfile for Hugging Face Spaces deployment
+# Combines frontend and backend into a single container
+
+# ============================================
+# Stage 1: Build Frontend
+# ============================================
+FROM node:18-alpine AS frontend-builder
+
+WORKDIR /app/frontend
+
+# Copy frontend package files
+COPY frontend/package*.json ./
+
+# Install dependencies
+RUN npm install --legacy-peer-deps
+
+# Copy frontend source
+COPY frontend/ ./
+
+# Set build-time environment variable for API URL
+ARG VITE_API_BASE_URL=/api
+ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
+
+# Build frontend
+RUN npm run build
+
+# ============================================
+# Stage 2: Build Backend
+# ============================================
+FROM maven:3.9.6-eclipse-temurin-17 AS backend-builder
+
+WORKDIR /app/backend
+
+# Copy pom.xml first for dependency caching
+COPY backend/pom.xml ./
+
+# Download dependencies
+RUN mvn dependency:go-offline -B
+
+# Copy backend source
+COPY backend/src ./src
+
+# Build backend (skip tests for faster build)
+RUN mvn clean package -DskipTests
+
+# ============================================
+# Stage 3: Production Runtime
+# ============================================
+FROM eclipse-temurin:17-jre-jammy
+
+WORKDIR /app
+
+# Install nginx for serving frontend
+RUN apt-get update && \
+    apt-get install -y nginx && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy built frontend from frontend-builder stage
+COPY --from=frontend-builder /app/frontend/dist /usr/share/nginx/html
+
+# Copy nginx configuration
+COPY frontend/nginx.conf /etc/nginx/conf.d/default.conf
+
+# Copy built backend JAR
+COPY --from=backend-builder /app/backend/target/*.jar /app/backend.jar
+
+# Create a startup script
+RUN cat > /app/start.sh << 'EOF'
+#!/bin/bash
+
+# Start nginx in background
+nginx
+
+# Start Spring Boot application in foreground
+exec java -jar /app/backend.jar
+EOF
+
+RUN chmod +x /app/start.sh
+
+# Hugging Face Spaces expects the app to run on port 7860
+EXPOSE 7860
+
+# Set environment variables
+ENV SERVER_PORT=7860
+ENV SPRING_PROFILES_ACTIVE=prod
+
+# Start both nginx and Spring Boot
+CMD ["/app/start.sh"]