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_utils.py

@@ -0,0 +1,19 @@
+"""Tests for text utility functions."""
+import sys
+import os
+
+# Add backend to path so we can import utils directly
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
+
+from app.utils.file_validator import validate_file
+from app.utils.sanitizer import generate_safe_path
+
+
+def test_generate_safe_path():
+    """generate_safe_path should produce UUID-based path."""
+    path = generate_safe_path('uploads', 'test.pdf')
+    assert path.startswith('uploads')
+    assert path.endswith('.pdf')
+    # Should contain a UUID directory
+    parts = path.replace('\\', '/').split('/')
+    assert len(parts) >= 3  # uploads / uuid / filename.pdf