feat: 初始化考培练系统项目

- 从服务器拉取完整代码
- 按框架规范整理项目结构
- 配置 Drone CI 测试环境部署
- 包含后端(FastAPI)、前端(Vue3)、管理端

技术栈: Vue3 + TypeScript + FastAPI + MySQL

backend/setup.cfg

@@ -0,0 +1,40 @@
+[flake8]
+max-line-length = 88
+max-complexity = 10
+extend-ignore = E203, W503
+exclude = .git,__pycache__,venv,migrations
+
+[mypy]
+python_version = 3.8
+warn_return_any = True
+warn_unused_configs = True
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+check_untyped_defs = True
+disallow_untyped_decorators = True
+no_implicit_optional = True
+warn_redundant_casts = True
+warn_unused_ignores = True
+warn_no_return = True
+warn_unreachable = True
+strict_equality = True
+
+[isort]
+profile = black
+multi_line_output = 3
+include_trailing_comma = True
+force_grid_wrap = 0
+use_parentheses = True
+ensure_newline_before_comments = True
+line_length = 88
+
+[tool:pytest]
+testpaths = tests
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+addopts = -v --strict-markers --tb=short
+markers =
+    unit: Unit tests
+    integration: Integration tests
+    e2e: End-to-end tests