Initial commit: Phase 1 scaffolding complete

- Root package.json with concurrently for dev server
- Client: Vite + React 18 with design tokens and proxy config
- Server: Express with CORS, multer (20MB), Sharp resize
- Upload endpoint with preview generation
- Dockerfile (multi-stage) and docker-compose.yml
- Canvas deferred to Phase 8 (export functionality)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,48 @@
+# Stage 1: Build client
+FROM node:20-alpine AS client-builder
+
+WORKDIR /app/client
+
+COPY client/package*.json ./
+RUN npm install
+
+COPY client/ ./
+RUN npm run build
+
+# Stage 2: Production server
+FROM node:20-alpine
+
+# Install system dependencies for node-canvas and sharp
+RUN apk add --no-cache \
+    cairo-dev \
+    pango-dev \
+    libjpeg-turbo-dev \
+    giflib-dev \
+    librsvg-dev \
+    pixman-dev \
+    python3 \
+    make \
+    g++
+
+WORKDIR /app
+
+# Copy server package files and install
+COPY server/package*.json ./server/
+RUN cd server && npm install --production
+
+# Copy server source
+COPY server/ ./server/
+
+# Copy built client from builder
+COPY --from=client-builder /app/client/dist ./server/dist
+
+# Create data directories
+RUN mkdir -p /app/server/uploads /app/server/exports
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:3001/api/health || exit 1
+
+EXPOSE 3001
+
+CMD ["node", "server/index.js"]