Add initial project configuration and setup for Reference Board Viewer application. Include EditorConfig for consistent coding styles, pre-commit hooks for linting and formatting, Docker Compose for local development with PostgreSQL and MinIO, and a Nix flake for development environment management. Establish CI/CD pipeline for automated testing and deployment.

backend/pytest.ini

@@ -0,0 +1,54 @@
+[pytest]
+# Test discovery
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+
+# Output options
+addopts =
+    --strict-markers
+    --tb=short
+    --cov=app
+    --cov-report=term-missing:skip-covered
+    --cov-report=html
+    --cov-report=xml
+    --cov-fail-under=80
+    -v
+    --color=yes
+
+# Async support
+asyncio_mode = auto
+
+# Markers
+markers =
+    slow: marks tests as slow (deselect with '-m "not slow"')
+    integration: marks tests as integration tests
+    unit: marks tests as unit tests
+    auth: marks tests related to authentication
+    boards: marks tests related to boards
+    images: marks tests related to images
+    upload: marks tests related to file uploads
+
+# Coverage options
+[coverage:run]
+source = app
+omit =
+    tests/*
+    alembic/*
+    app/__init__.py
+    */migrations/*
+
+[coverage:report]
+precision = 2
+show_missing = true
+skip_covered = false
+exclude_lines =
+    pragma: no cover
+    def __repr__
+    raise AssertionError
+    raise NotImplementedError
+    if __name__ == .__main__.:
+    if TYPE_CHECKING:
+    @abstractmethod
+