Initial commit with Dockerfile and demo code

Dockerfile

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+# Stage 1: Build web frontend
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+# Copy dependency manifests for workspace caching
+COPY package.json package-lock.json ./
+COPY server/package.json ./server/
+COPY web/package.json ./web/
+
+# Install all dependencies (including devDependencies for Vite)
+RUN npm ci
+
+# Copy application source
+COPY . .
+
+# Build frontend to web/dist
+RUN npm run build
+
+# Stage 2: Production runner
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=8787
+
+# Copy app files from builder
+COPY --from=builder /app ./
+
+EXPOSE 8787
+
+CMD ["node", "server/index.js"]