feat: bootstrap backend MVP and architecture docs

backend/pyproject.toml

@@ -0,0 +1,29 @@
+[project]
+name = "memberapi-backend"
+version = "0.1.0"
+description = "memberapi.ose.tw backend"
+requires-python = ">=3.12"
+dependencies = [
+  "fastapi>=0.116.0",
+  "uvicorn[standard]>=0.35.0",
+  "sqlalchemy>=2.0.44",
+  "psycopg[binary]>=3.2.9",
+  "pydantic-settings>=2.11.0",
+  "python-dotenv>=1.1.1",
+  "passlib[bcrypt]>=1.7.4",
+]
+
+[project.optional-dependencies]
+dev = [
+  "pytest>=8.4.2",
+  "httpx>=0.28.1",
+  "ruff>=0.13.0",
+]
+
+[tool.pytest.ini_options]
+pythonpath = ["."]
+addopts = "-q"
+
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"