added deployment files

Dockerfile

@@ -0,0 +1,28 @@
+# ─── Stage 1: Build ──────────────────────────────────────────────────────────
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Install dependencies first (layer-cache friendly)
+COPY package.json package-lock.json ./
+RUN npm ci --frozen-lockfile
+
+# Copy source and build
+COPY . .
+RUN npm run build
+
+# ─── Stage 2: Serve ──────────────────────────────────────────────────────────
+FROM nginx:1.27-alpine AS runner
+
+# Remove default nginx content
+RUN rm -rf /usr/share/nginx/html/*
+
+# Copy built assets from builder stage
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copy custom nginx config (handles SPA routing)
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]