Initialize backend project with essential files and configurations

.gitignore

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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv

.python-version

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+3.12

main.py

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+def main():
+    print("Hello from backend!")
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

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+[project]
+name = "backend"
+version = "0.1.0"
+description = "Add your description here"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = []
+
+[dependency-groups]
+dev = ["black==25.1.0", "pytest==8.4.1", "ruff==0.12.2"]
+
+[tool.black]
+line-length = 80
+
+[tool.ruff]
+line-length = 80
+lint.select = ["ALL"]
+lint.ignore = ["D100", "D104"]