chore: configure python quality tooling

Co-authored-by: OpenAI/GPT-5.6-Terra <vibecoder@antoineve.me>
Co-authored-by: OpenAI/GPT-5.6-Luna <vibecoder@antoineve.me>

pyproject.toml

@@ -0,0 +1,18 @@
+[tool.ruff]
+target-version = "py310"
+line-length = 100
+include = ["*.py"]
+
+[tool.ruff.lint]
+select = ["E4", "E7", "E9", "F", "I"]
+
+# Ces imports différés sont intentionnels : ils évitent des dépendances
+# circulaires ou préparent sys.path pour les scripts lancés directement.
+[tool.ruff.lint.per-file-ignores]
+"app/business/time_calc.py" = ["E402"]
+"scripts/import_csv.py" = ["E402"]
+"tests/test_time_calc.py" = ["E402"]
+
+[tool.ruff.format]
+quote-style = "double"
+indent-style = "space"