Add Dockerfile.react and Dockerfile.remote for React build targets

Standalone SSR image (Node 24 slim) and remote MF static image (nginx alpine),
coexisting with legacy ASP.NET Dockerfile.

Dockerfile.remote

@@ -0,0 +1,28 @@
+# Dockerfile.remote — nginx-based static file server for remote MF artifact
+
+# Stage 1: Install dependencies
+FROM node:24-slim AS deps
+WORKDIR /app
+
+RUN corepack enable pnpm
+
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+# Stage 2: Build remote target
+FROM deps AS build
+WORKDIR /app
+
+COPY modern.config.ts module-federation.config.ts tsconfig.json ./
+COPY src/ src/
+
+RUN pnpm build:remote
+
+# Stage 3: Serve static files with nginx
+FROM nginx:alpine AS runtime
+
+COPY --from=build /app/dist/remote/ /usr/share/nginx/html/
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]