chore(mypy): Add missing type stubs for yaml, sklearn, tqdm, umap

[rogermt]

Problem

Mypy type checking fails with 7 pre-existing errors:

1. yaml - Missing library stubs

   • Solution: pip install types-PyYAML
   • File: src/forgesyte_yolo_tracker/configs/init.py:6

2. sklearn.cluster - Missing library stubs or py.typed marker

   • File: src/forgesyte_yolo_tracker/utils/team.py:8

3. tqdm - Missing library stubs

   • Solution: pip install types-tqdm
   • File: src/forgesyte_yolo_tracker/utils/team.py:9

4. umap - Missing library stubs or py.typed marker

   • File: src/forgesyte_yolo_tracker/utils/team.py:13

5. app.models - Cannot find implementation (FastAPI context)

   • Files: src/forgesyte_yolo_tracker/plugin.py:18, src/tests/test_plugin_all_detections.py:13
   • Note: This is expected in CPU-only environment

Solution

Install missing type stub packages in dev dependencies:

uv pip install types-PyYAML types-tqdm

For sklearn and umap, consider:

• Using scikit-learn with py.typed support (already installed)
• Using umap-learn with py.typed support (already installed)
• Or suppress these specific errors in mypy.ini

Impact

• Blocks full mypy type checking in CI/CD pipelines
• Not critical for runtime functionality
• Should be resolved before production deployment