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/tests/test_health.py

@@ -0,0 +1,15 @@
+"""Tests for health check and app creation."""
+
+
+def test_health_endpoint(client):
+    """GET /api/health should return 200."""
+    response = client.get('/api/health')
+    assert response.status_code == 200
+    data = response.get_json()
+    assert data['status'] == 'healthy'
+
+
+def test_app_creates(app):
+    """App should create without errors."""
+    assert app is not None
+    assert app.config['TESTING'] is True