Add Dockerfile for Coolify deployment

Dockerfile

@@ -0,0 +1,40 @@
+# ---------------------------------------------------------
+#  Build stage
+# ---------------------------------------------------------
+FROM node:18-alpine AS builder
+
+# Install git (needed by some npm postinstall scripts)
+RUN apk add --no-cache git
+
+WORKDIR /app
+
+# Install dependencies strictly from lockfile
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# Copy source files
+COPY . .
+
+# Build the Vite production bundle
+ENV NODE_ENV=production
+RUN npm run build
+
+# ---------------------------------------------------------
+#  Production stage – tiny static server
+# ---------------------------------------------------------
+FROM nginx:alpine
+
+# Remove default nginx config
+RUN rm /etc/nginx/conf.d/default.conf
+
+# Copy custom config
+COPY nginx.conf /etc/nginx/conf.d
+
+# Copy built assets
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Expose port (Coolify expects 80 by default)
+EXPOSE 80
+
+# Start nginx in foreground
+CMD ["nginx", "-g", "daemon off;"]