Add Dockerfile and .dockerignore for Dokploy deployment

Dockerfile

@@ -0,0 +1,15 @@
+FROM node:24-alpine AS build
+WORKDIR /app
+COPY client/package*.json ./client/
+RUN cd client && npm ci
+COPY client/ ./client/
+RUN cd client && npm run build
+
+FROM node:24-alpine
+WORKDIR /app
+COPY server/package*.json ./server/
+RUN cd server && npm ci --omit=dev
+COPY server/ ./server/
+COPY --from=build /app/client/dist ./client/dist
+EXPOSE 3001
+CMD ["node", "server/index.js"]