V2 docker support react version2 (#3930)

# Description of Changes

<!--
Please provide a summary of the changes, including:

- What was changed
- Why the change was made
- Any challenges encountered

Closes #(issue_number)
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---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

---------

Co-authored-by: a <a>

docker/frontend/Dockerfile

@@ -0,0 +1,38 @@
+# Frontend Dockerfile - React/Vite application
+FROM node:20-alpine AS build
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Production stage
+FROM nginx:alpine
+
+# Copy built files from build stage
+COPY --from=build /app/dist /usr/share/nginx/html
+
+# Copy nginx configuration and entrypoint
+COPY nginx.conf /etc/nginx/nginx.conf
+COPY entrypoint.sh /entrypoint.sh
+
+# Make entrypoint executable
+RUN chmod +x /entrypoint.sh
+
+# Expose port 80 (standard HTTP port)
+EXPOSE 80
+
+# Environment variables for flexibility
+ENV BACKEND_URL=http://backend:8080
+
+# Use custom entrypoint
+ENTRYPOINT ["/entrypoint.sh"]

docker/frontend/entrypoint.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Set default backend URL if not provided
+BACKEND_URL=${BACKEND_URL:-"http://backend:8080"}
+
+# Replace the placeholder in nginx.conf with the actual backend URL
+sed -i "s|\${BACKEND_URL}|${BACKEND_URL}|g" /etc/nginx/nginx.conf
+
+# Start nginx
+exec nginx -g "daemon off;"

docker/frontend/nginx.conf

@@ -0,0 +1,49 @@
+events {
+    worker_connections 1024;
+}
+
+http {
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;
+
+    server {
+        listen 80;
+        server_name _;
+        root /usr/share/nginx/html;
+        index index.html index.htm;
+
+        # Handle client-side routing - support subpaths
+        location / {
+            try_files $uri $uri/ /index.html;
+        }
+
+        # Proxy API calls to backend
+        location /api/ {
+            proxy_pass ${BACKEND_URL}/api/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+            proxy_set_header X-Forwarded-Host $host;
+            proxy_set_header X-Forwarded-Port $server_port;
+        }
+
+        # Cache static assets
+        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+            expires 1y;
+            add_header Cache-Control "public, immutable";
+        }
+
+        # Security headers
+        add_header X-Frame-Options "SAMEORIGIN" always;
+        add_header X-Content-Type-Options "nosniff" always;
+        add_header X-XSS-Protection "1; mode=block" always;
+        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+    }
+}