chore: bootstrap kbqa workspace

backend/pyproject.toml

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+[project]
+name = "kbqa"
+version = "0.1.0"
+description = "Local dual-agent knowledge-base question answering system"
+readme = "../README.md"
+requires-python = ">=3.12,<3.13"
+dependencies = [
+  "aiosqlite>=0.21,<1",
+  "alembic>=1.16,<2",
+  "fastapi>=0.116,<1",
+  "langchain>=1,<2",
+  "langchain-openai>=1,<2",
+  "langchain-text-splitters>=1,<2",
+  "pydantic-settings>=2.10,<3",
+  "pymilvus[milvus-lite]>=2.6,<3",
+  "pypdf>=5,<7",
+  "python-multipart>=0.0.20,<1",
+  "sqlalchemy[asyncio]>=2.0.41,<3",
+  "uvicorn[standard]>=0.35,<1",
+]
+
+[dependency-groups]
+dev = [
+  "httpx>=0.28,<1",
+  "pytest>=8,<10",
+  "pytest-asyncio>=1,<2",
+  "pytest-timeout>=2,<3",
+  "ruff>=0.12,<1",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/kbqa"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+markers = ["live: requires real DashScope and LangSmith credentials"]
+
+[tool.ruff]
+target-version = "py312"
+line-length = 100

backend/src/kbqa/__init__.py

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+"""Local dual-agent knowledge-base question answering system."""
+
+__version__ = "0.1.0"