feat: add Dockerfile, captain-definition, and production-ready Nginx configuration for deployment

Dockerfile

@@ -0,0 +1,26 @@
+# ── Stage 1: Build ──────────────────────────────────────────────
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+# ── Stage 2: Serve ──────────────────────────────────────────────
+FROM nginx:stable-alpine
+
+# Remove default nginx static assets
+RUN rm -rf /usr/share/nginx/html/*
+
+# Copy built output from builder
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# nginx config — SPA-friendly: route all 404s back to index.html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]