feat: Consolidate client and server into a single Docker image and update Docker Compose configuration.

Dockerfile

@@ -0,0 +1,37 @@
+# Build stage - build client assets
+FROM node:20-alpine AS client-builder
+
+WORKDIR /app/client
+COPY client/package.json client/package-lock.json* ./
+RUN npm ci
+COPY client/ ./
+RUN npm run build
+
+# Production stage - run server with built client
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Copy server package files and install dependencies
+COPY package.json package-lock.json* ./
+RUN npm ci --omit=dev
+
+# Copy server source
+COPY server ./server
+
+# Copy built client assets
+COPY --from=client-builder /app/client/dist ./client/dist
+
+# Create data directory for SQLite
+RUN mkdir -p /app/data
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:3000/api/health || exit 1
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+EXPOSE 3000
+
+CMD ["node", "server/index.js"]