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()

backend/tests/test_compress.py

@@ -0,0 +1,21 @@
+"""Tests for PDF compression endpoint."""
+import io
+
+
+def test_compress_pdf_no_file(client):
+    """POST /api/compress/pdf without file should return 400."""
+    response = client.post('/api/compress/pdf')
+    assert response.status_code == 400
+
+
+def test_compress_pdf_wrong_extension(client):
+    """POST /api/compress/pdf with non-PDF should return 400."""
+    data = {
+        'file': (io.BytesIO(b'hello'), 'test.docx'),
+    }
+    response = client.post(
+        '/api/compress/pdf',
+        data=data,
+        content_type='multipart/form-data',
+    )
+    assert response.status_code == 400

backend/tests/test_convert.py

@@ -0,0 +1,42 @@
+"""Tests for file conversion endpoints."""
+import io
+
+
+def test_pdf_to_word_no_file(client):
+    """POST /api/convert/pdf-to-word without file should return 400."""
+    response = client.post('/api/convert/pdf-to-word')
+    assert response.status_code == 400
+    data = response.get_json()
+    assert 'error' in data
+
+
+def test_pdf_to_word_wrong_extension(client):
+    """POST /api/convert/pdf-to-word with non-PDF should return 400."""
+    data = {
+        'file': (io.BytesIO(b'hello world'), 'test.txt'),
+    }
+    response = client.post(
+        '/api/convert/pdf-to-word',
+        data=data,
+        content_type='multipart/form-data',
+    )
+    assert response.status_code == 400
+
+
+def test_word_to_pdf_no_file(client):
+    """POST /api/convert/word-to-pdf without file should return 400."""
+    response = client.post('/api/convert/word-to-pdf')
+    assert response.status_code == 400
+
+
+def test_word_to_pdf_wrong_extension(client):
+    """POST /api/convert/word-to-pdf with non-Word file should return 400."""
+    data = {
+        'file': (io.BytesIO(b'hello world'), 'test.pdf'),
+    }
+    response = client.post(
+        '/api/convert/word-to-pdf',
+        data=data,
+        content_type='multipart/form-data',
+    )
+    assert response.status_code == 400

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

backend/tests/test_image.py

@@ -0,0 +1,27 @@
+"""Tests for image conversion & resize endpoints."""
+import io
+
+
+def test_image_convert_no_file(client):
+    """POST /api/image/convert without file should return 400."""
+    response = client.post('/api/image/convert')
+    assert response.status_code == 400
+
+
+def test_image_resize_no_file(client):
+    """POST /api/image/resize without file should return 400."""
+    response = client.post('/api/image/resize')
+    assert response.status_code == 400
+
+
+def test_image_convert_wrong_type(client):
+    """POST /api/image/convert with non-image should return 400."""
+    data = {
+        'file': (io.BytesIO(b'not an image'), 'test.pdf'),
+    }
+    response = client.post(
+        '/api/image/convert',
+        data=data,
+        content_type='multipart/form-data',
+    )
+    assert response.status_code == 400

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