add docker

Dockerfile

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+# Development Dockerfile
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Install basic tools
+RUN apk add --no-cache git
+
+# Copy package files
+COPY package.json yarn.lock* package-lock.json* ./
+
+# Install dependencies
+RUN npm install --frozen-lockfile || yarn install --frozen-lockfile
+
+# Copy source code
+COPY . .
+
+# Expose dev port
+EXPOSE 3030
+
+# Run development server
+CMD ["npm", "run", "dev"]