Add optimized multi-stage Dockerfile

Dockerfile

@@ -0,0 +1,66 @@
+# Multi-stage Docker build for BREEDR
+# Stage 1: Build frontend
+FROM node:18-alpine AS frontend-builder
+
+WORKDIR /app/client
+
+# Copy client package files
+COPY client/package*.json ./
+
+# Install frontend dependencies
+RUN npm ci --production=false
+
+# Copy frontend source
+COPY client/ ./
+
+# Build frontend for production
+RUN npm run build
+
+# Stage 2: Build backend and final image
+FROM node:18-alpine AS production
+
+# Install sqlite3 dependencies
+RUN apk add --no-cache \
+    python3 \
+    make \
+    g++ \
+    sqlite
+
+WORKDIR /app
+
+# Copy root package files
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm ci --production
+
+# Copy server code
+COPY server/ ./server/
+
+# Copy built frontend from previous stage
+COPY --from=frontend-builder /app/client/dist ./client/dist
+
+# Create necessary directories
+RUN mkdir -p /app/data /app/uploads
+
+# Initialize database schema on build
+RUN node server/db/init.js || true
+
+# Set environment variables
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV DB_PATH=/app/data/breedr.db
+ENV UPLOAD_PATH=/app/uploads
+
+# Expose application port
+EXPOSE 3000
+
+# Set up volumes for persistent data
+VOLUME ["/app/data", "/app/uploads"]
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:3000/api/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"
+
+# Start the application
+CMD ["node", "server/index.js"]