Add Dockerfile and nginx config for SPA deployment on Coolify

Dockerfile

@@ -0,0 +1,16 @@
+FROM node:22-alpine AS build
+
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+WORKDIR /app
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+COPY . .
+RUN pnpm build
+
+FROM nginx:alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80