Refactor into standard Python package with uv

- Move all code into src/mouse_control/ following the src-layout convention,
  with model/collect/train/visualize/inference as separate modules and
  SimpleNet extracted into model.py
- Add hatchling-based pyproject.toml with three CLI entry points
  (mouse-collect, mouse-train, mouse-visualize) and bundle the trained
  ONNX model as a package resource under assets/
- Move training data to data/, delete superseded show.py, remove dead
  imports (numpy, onnxruntime, onnx, onnxsim) and the unused
  visualize_path() helper
- Fix crashes in the collector: guard against destroyed-widget access
  after the n==100 destroy(), and skip save_to_csv when recording is
  off or the path is too short to derive 10 keypoints
- Switch ONNX export to external_data=False so the model ships as a
  single self-contained 19KB file
- Bytes-load the bundled model via importlib.resources so packaging
  remains correct under zip-safe distributions
- Rewrite README around the new layout, commands, and public API

pyproject.toml

@@ -0,0 +1,44 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "mouse-control"
+version = "0.1.0"
+description = "Neural-network mouse trajectory generation that mimics human motion."
+readme = "README.md"
+requires-python = ">=3.12"
+keywords = ["mouse", "trajectory", "neural-network", "onnx", "anti-detection"]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.12",
+    "Operating System :: Microsoft :: Windows",
+    "Topic :: Scientific/Engineering :: Artificial Intelligence",
+]
+dependencies = [
+    "matplotlib>=3.10",
+    "numpy>=2.0",
+    "onnxruntime>=1.20",
+    "onnxscript>=0.7",
+    "pandas>=2.0",
+    "scipy>=1.14",
+    "torch>=2.5",
+]
+
+[project.scripts]
+mouse-collect = "mouse_control.collect:main"
+mouse-train = "mouse_control.train:main"
+mouse-visualize = "mouse_control.visualize:main"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/mouse_control"]
+artifacts = ["src/mouse_control/assets/*.onnx"]
+
+[tool.hatch.build.targets.sdist]
+include = [
+    "src/",
+    "data/",
+    "imgs/",
+    "README.md",
+    "pyproject.toml",
+]