chore: pin runtime + dev dependencies and configure pytest/ruff

pyproject.toml

@@ -0,0 +1,16 @@
+[tool.pytest.ini_options]
+pythonpath = ["."]
+markers = [
+    "gpu: marks tests that need a GPU (use --gpu to enable)",
+]
+
+[tool.ruff]
+line-length = 100
+target-version = "py311"
+
+[tool.ruff.lint]
+select = ["E", "F", "I", "B", "UP"]
+ignore = ["E501"]  # line length is enforced by formatter, not linter
+
+[tool.ruff.lint.per-file-ignores]
+"tests/*" = ["E402"]  # imports inside test functions are fine

requirements.txt

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+gradio>=5.0,<6.0
+spaces>=0.30.0
+huggingface_hub>=0.27.0
+torch>=2.4.0
+torchvision
+torchaudio
+numpy
+Pillow
+einops
+safetensors
+tqdm
+
+# Dev / test
+pytest>=8.0
+pytest-asyncio>=0.23
+ruff>=0.5