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.

pyproject.toml

@@ -0,0 +1,70 @@
+[project]
+name = "imago"
+version = "2.0.0"
+description = "Backend FastAPI pour la gestion d'images et fonctionnalités AI — Imago"
+requires-python = ">=3.12"
+license = "MIT"
+
+[tool.ruff]
+target-version = "py312"
+line-length = 120
+src = ["app", "tests"]
+
+[tool.ruff.lint]
+select = [
+    "E",      # pycodestyle errors
+    "W",      # pycodestyle warnings
+    "F",      # pyflakes
+    "I",      # isort
+    "N",      # pep8-naming
+    "UP",     # pyupgrade
+    "B",      # bugbear
+    "S",      # bandit (security)
+    "T20",    # flake8-print (catch stray print())
+    "SIM",    # flake8-simplify
+    "RUF",    # ruff-specific
+]
+ignore = [
+    "S101",   # allow assert in tests
+    "S104",   # allow 0.0.0.0 bindings
+    "B008",   # allow Depends() in function args (FastAPI pattern)
+    "E501",   # line length handled by formatter
+    "UP007",  # keep Optional[] syntax for readability
+]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = ["S101", "S106", "T20"]
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"
+docstring-code-format = true
+
+[tool.mypy]
+python_version = "3.12"
+warn_return_any = true
+warn_unused_configs = true
+ignore_missing_imports = true
+check_untyped_defs = true
+plugins = ["pydantic.mypy"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+python_files = ["test_*.py"]
+python_functions = ["test_*"]
+filterwarnings = ["ignore::DeprecationWarning"]
+addopts = "--tb=short -q"
+
+[tool.coverage.run]
+source = ["app"]
+omit = ["app/workers/*", "tests/*"]
+
+[tool.coverage.report]
+show_missing = true
+fail_under = 60
+exclude_lines = [
+    "pragma: no cover",
+    "if __name__ ==",
+    "if TYPE_CHECKING:",
+]