Update .gitignore to include .venv and ensure proper formatting

.gitignore

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+Qwen3-1.7B/**
+**/__pycache__/**
+
+.venv

.python-version

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+3.13

main.py

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+def main():
+    print("Hello from deal-classification!")
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

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+[project]
+name = "deal-classification"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = [
+    "matplotlib>=3.10.8",
+    "pandas>=3.0.0",
+    "torch>=2.10.0",
+    "transformers>=5.0.0",
+]