Add Dockerfile and Nginx configuration for React application deployment

Dockerfile

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+# Stage 1: Build the React application
+FROM node:20-alpine AS builder
+RUN apk add --no-cache libc6-compat
+
+WORKDIR /app
+
+# 1) Copy package files & install
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm install
+
+# 2) Copy source & build into dist/
+COPY frontend ./
+RUN npm run build
+
+# Stage 2: Serve the React build with Nginx
+FROM bitnami/nginx:1.26.1
+
+WORKDIR /app
+
+# 1) Copy your custom Nginx config
+#    (make sure your nginx.conf listens on 7860 and points root to /usr/share/nginx/html)
+COPY nginx.conf /opt/bitnami/nginx/conf/nginx.conf
+
+# 2) Copy the static build from the builder
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# 3) Expose the HF Spaces port
+EXPOSE 7860
+
+# 4) Launch Nginx in the foreground
+CMD ["nginx", "-g", "daemon off;"]

frontend

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+Subproject commit baf5d1a56279e810a15f870759dbe098af9b6a2d

nginx.conf

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+worker_processes 1;
+
+events { worker_connections 1024; }
+
+http {
+  include       mime.types;
+  default_type  application/octet-stream;
+  sendfile       on;
+  keepalive_timeout 65;
+
+  server {
+    listen       7860;
+    server_name  localhost;
+
+    root   /usr/share/nginx/html;
+    index  index.html;
+
+    # Serve files, fallback to index.html for client‑side routing
+    location / {
+      try_files $uri $uri/ /index.html;
+    }
+
+    # Optional: caching static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|svg|ico)$ {
+      expires 30d;
+      add_header Cache-Control "public";
+    }
+  }
+}
+    
+