feat: add Docker configuration for deployment

.dockerignore

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+node_modules/
+.env
+data/
+*.log

.env.development

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+# SimpleNote Web - Development Environment
+
+# Server
+PORT=3000
+NODE_ENV=development
+
+# Auth - generate with: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
+ADMIN_TOKEN=dev-admin-token-change-in-production
+
+# Data
+DATA_ROOT=./data
+
+# CORS (comma-separated origins or * for all)
+CORS_ORIGIN=http://localhost:5173,http://localhost:3000

.env.production

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+# SimpleNote Web - Production Environment
+
+# Server
+PORT=3000
+NODE_ENV=production
+
+# Auth
+ADMIN_TOKEN=change-me-in-production
+
+# Data
+DATA_ROOT=./data
+
+# CORS (comma-separated origins or * for all)
+CORS_ORIGIN=*

Dockerfile

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+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci --only=production
+
+COPY src/ ./src/
+COPY data/ ./data/
+COPY ui/ ./ui/
+COPY .env.example ./
+
+EXPOSE 3000
+
+ENV NODE_ENV=production
+ENV PORT=3000
+
+CMD ["node", "src/index.js"]

docker-compose.yml

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+services:
+  web:
+    build: .
+    container_name: simplenote-web
+    restart: unless-stopped
+    ports:
+      - "${SIMPLENOTE_PORT:-3000}:3000"
+    environment:
+      - NODE_ENV=production
+      - PORT=3000
+      - ADMIN_TOKEN=${SIMPLENOTE_ADMIN_TOKEN}
+      - DATA_ROOT=/app/data
+      - CORS_ORIGIN=${SIMPLENOTE_CORS_ORIGIN:-*}
+    volumes:
+      - simplenote-data:/app/data
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:3000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+volumes:
+  simplenote-data: