feat: Initialize frontend with React, Vite, and Tailwind CSS

- Set up main entry point for React application.
- Create About, Home, NotFound, Privacy, and Terms pages with SEO support.
- Implement API service for file uploads and task management.
- Add global styles using Tailwind CSS.
- Create utility functions for SEO and text processing.
- Configure Vite for development and production builds.
- Set up Nginx configuration for serving frontend and backend.
- Add scripts for cleanup of expired files and sitemap generation.
- Implement deployment script for production environment.

backend/app/middleware/rate_limiter.py

@@ -0,0 +1,18 @@
+"""Rate limiting middleware configuration."""
+from app.extensions import limiter
+
+
+# Custom rate limits for specific operations
+UPLOAD_LIMIT = "10/minute"
+DOWNLOAD_LIMIT = "30/minute"
+API_LIMIT = "100/hour"
+
+
+def get_upload_limit():
+    """Get the rate limit for file upload endpoints."""
+    return UPLOAD_LIMIT
+
+
+def get_download_limit():
+    """Get the rate limit for file download endpoints."""
+    return DOWNLOAD_LIMIT