refactor: 文档维护点收归mipu-api，新增SDK

- 移除 docs/ 和 Release CI，文档维护点收归 mipu-api 子模块
- 新增 sdk/mipu_requests Python SDK（构造参数传入凭据）
- 新增 CLAUDE.md 标注文档维护路径
- 精简 README

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sdk/pyproject.toml

@@ -0,0 +1,38 @@
+[build-system]
+requires = ["setuptools>=64", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "mipu-requests"
+version = "1.0.0"
+description = "米普代理 HTTP 客户端，兼容 requests 接口"
+readme = "README.md"
+license = "MIT"
+requires-python = ">=3.8"
+authors = [
+    { name = "MipuYun", email = "support@mipuyun.com" },
+]
+keywords = ["mipu", "requests", "proxy", "http", "api"]
+classifiers = [
+    "Development Status :: 4 - Beta",
+    "Intended Audience :: Developers",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Topic :: Internet :: WWW/HTTP",
+]
+dependencies = [
+    "requests>=2.20",
+]
+
+[project.urls]
+Repository = "https://git.addhh.com/willow/mipu-open"
+
+[tool.setuptools.packages.find]
+include = ["mipu_requests*"]
+
+[tool.setuptools.package-data]
+mipu_requests = ["py.typed"]