chore: 项目骨架与 pyproject 打包（src 布局 + pytest 就绪）

pyproject.toml

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+[build-system]
+requires = ["setuptools>=69"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "genesis"
+version = "0.1.0"
+description = "概要设计书自动生成 Agent"
+requires-python = ">=3.11"
+dependencies = [
+  "pydantic>=2.13",
+  "pydantic-settings>=2.15",
+  "pyyaml>=6.0",
+  "openpyxl>=3.1",
+  "python-docx>=1.0",
+]
+
+[project.optional-dependencies]
+dev = ["pytest>=8.0"]
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]

src/genesis/__init__.py

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+"""Genesis：概要设计书自动生成 Agent。"""
+__version__ = "0.1.0"

tests/test_smoke.py

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+import genesis
+
+
+def test_package_importable():
+    assert genesis.__version__ == "0.1.0"