Add Dockerfile for Coolify deployment

Dockerfile

@@ -0,0 +1,15 @@
+# Build stage
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine
+WORKDIR /app
+RUN npm install -g serve
+COPY --from=build /app/dist ./dist
+EXPOSE 3000
+CMD ["serve", "-s", "dist", "-l", "3000"]