feat: add Dockerfile for frontend deployment

frontend/Dockerfile

@@ -0,0 +1,32 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files and install dependencies
+COPY package.json package-lock.json ./
+RUN npm ci
+
+# Copy source code and build
+COPY . .
+RUN npm run build
+
+# Production stage (Nginx)
+FROM nginx:alpine
+
+# Copy built files to Nginx
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Default Nginx config for Single Page Apps (Vite)
+RUN echo 'server { \
+    listen 80; \
+    location / { \
+        root /usr/share/nginx/html; \
+        index index.html; \
+        try_files $uri $uri/ /index.html; \
+    } \
+}' > /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]