Add comprehensive test suite for image processing and related services

- Implement tests for database generator to ensure proper session handling.
- Create tests for EXIF extraction and conversion functions.
- Add tests for image-related endpoints, ensuring proper data retrieval and isolation between clients.
- Develop tests for OCR functionality, including language detection and text extraction.
- Introduce tests for the image processing pipeline, covering success and failure scenarios.
- Validate rate limiting functionality and ensure independent counters for different clients.
- Implement scraper tests to verify HTML content fetching and error handling.
- Add unit tests for various services, including storage and filename generation.
- Establish worker entry point for ARQ to handle background image processing tasks.

.gitignore

@@ -0,0 +1,39 @@
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+*.pyd
+.Python
+*.egg-info/
+dist/
+build/
+.eggs/
+
+# Environnement virtuel
+venv/
+env/
+.venv/
+
+# Variables d'environnement
+.env
+
+# Données (images, BDD)
+data/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Tests
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Alembic
+alembic/versions/*.py
+
+# OS
+.DS_Store
+Thumbs.db