chore: scaffold yunke-server

Create pyproject.toml (FastAPI + SQLAlchemy + Playwright + APScheduler +
Redis + cryptography stack), .env.example, app/__init__.py and a
pydantic-settings Settings singleton (get_settings), and a root
.gitignore covering Python, Node, env, IDE and the local media dir.

Co-Authored-By: Claude <noreply@anthropic.com>

yunke-server/pyproject.toml

@@ -0,0 +1,43 @@
+[project]
+name = "yunke-server"
+version = "0.1.0"
+description = "云客数据本地化系统 - Python backend"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi",
+    "uvicorn[standard]",
+    "sqlalchemy[asyncio]",
+    "asyncmy",
+    "alembic",
+    "redis",
+    "httpx",
+    "playwright",
+    "apscheduler",
+    "pydantic",
+    "pydantic-settings",
+    "cryptography",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest",
+    "pytest-asyncio",
+    "respx",
+    "ruff",
+]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["app*"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "auto"
+testpaths = ["tests"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py311"