Add .gitignore (C#/Python) and enable Git LFS for zip, dll, exe, .weights

.gitattributes

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+# Git LFS: track large/binary files
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.dll filter=lfs diff=lfs merge=lfs -text
+*.exe filter=lfs diff=lfs merge=lfs -text
+*.weights filter=lfs diff=lfs merge=lfs -text

.gitignore

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+# .gitignore — C# (Visual Studio) + Python
+# ------------------------------------------------------------------
+
+# ----- Visual Studio / C# -----
+.vs/
+*.user
+*.userosscache
+*.suo
+*.sln.docstates
+*.suo
+*.cache
+# Build folders
+[Bb]in/
+[Oo]bj/
+# Rider/IDE
+.idea/
+# NuGet packages
+*.nupkg
+# Test results
+TestResults/
+
+# ----- Python -----
+# Byte-compiled / optimized
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Distribution / packaging
+build/
+dist/
+*.egg-info/
+.eggs/
+parts/
+sdist/
+
+# Virtual environments — ignore any folder starting with "venv"
+**/venv*/
+venv*/
+.venv/
+env/
+ENV/
+
+# Jupyter
+.ipynb_checkpoints/
+
+# Unit test / coverage
+.pytest_cache/
+.coverage
+.coverage.*
+htmlcov/
+.tox/
+.nox/
+
+# mypy
+.mypy_cache/
+
+# VS Code settings
+.vscode/
+
+# Misc
+*.log
+
+# NOTE: We DO NOT ignore binary types (zip, dll, exe, .weights) here because
+# they are tracked via Git LFS (configured in .gitattributes / git lfs track).