Add development configuration for marketing service in Docker and update frontend scripts

frontend/Dockerfile.marketing.dev

@@ -0,0 +1,20 @@
+# Marketing Development Dockerfile - Vite Dev Server with Hot Reload
+FROM node:18-alpine
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy source code (will be mounted as volume, but needed for initial setup)
+COPY . .
+
+# Expose Vite dev server port
+EXPOSE 5174
+
+# Start Vite dev server for marketing site
+CMD ["npm", "run", "dev:marketing"]
+