feat: initial SOCKS5 proxy with chain support

Asyncio-based SOCKS5 server that tunnels connections through
configurable chains of SOCKS5, SOCKS4/4a, and HTTP CONNECT proxies.
Tor integration via standard SOCKS5 hop.

pyproject.toml

@@ -0,0 +1,26 @@
+[build-system]
+requires = ["setuptools>=68.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "s5p"
+version = "0.1.0"
+description = "SOCKS5 proxy with Tor and proxy-chain support"
+requires-python = ">=3.11"
+dependencies = ["pyyaml>=6.0"]
+
+[project.scripts]
+s5p = "s5p.cli:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.ruff]
+target-version = "py311"
+line-length = 100
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "N", "UP"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]