chore: add pyproject.toml with ruff and pytest config

Pin Python 3.11 for parity with the Docker image. Dev deps live in
requirements-dev.txt for local lint/test without rembg/onnxruntime.

Co-authored-by: Cursor <cursoragent@cursor.com>

pyproject.toml

@@ -0,0 +1,41 @@
+[project]
+name = "livef12rocks"
+version = "0.1.0"
+description = "Event photo pep pipeline: Syncthing drop -> gmic/rembg -> web"
+readme = "README.md"
+requires-python = ">=3.11,<3.12"
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.3,<9",
+    "httpx>=0.27,<0.29",
+    "ruff>=0.8,<0.10",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+pythonpath = ["."]
+
+[tool.ruff]
+target-version = "py311"
+line-length = 120
+src = ["app", "tests"]
+
+[tool.ruff.lint]
+select = [
+    "E",   # pycodestyle errors
+    "F",   # pyflakes
+    "I",   # isort
+    "UP",  # pyupgrade
+    "B",   # flake8-bugbear
+    "SIM", # flake8-simplify
+]
+ignore = [
+    "B008",  # FastAPI Depends/Form in defaults is intentional
+]
+
+[tool.ruff.lint.per-file-ignores]
+"tests/**" = ["S101"]  # assert in tests
+
+[tool.ruff.format]
+quote-style = "double"