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/conftest.py

@@ -0,0 +1,26 @@
+import os
+import pytest
+from app import create_app
+
+
+@pytest.fixture
+def app():
+    """Create application for testing."""
+    os.environ['FLASK_ENV'] = 'testing'
+    app = create_app()
+    app.config.update({
+        'TESTING': True,
+    })
+    yield app
+
+
+@pytest.fixture
+def client(app):
+    """Flask test client."""
+    return app.test_client()
+
+
+@pytest.fixture
+def runner(app):
+    """Flask test CLI runner."""
+    return app.test_cli_runner()