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/mipu_requests/__init__.py

@@ -0,0 +1,41 @@
+"""
+mipu_requests — 通过米普代理转发 HTTP 请求的 requests 兼容客户端
+
+API 与 requests 完全一致，用户可平滑切换：
+
+    import mipu_requests
+
+    s = mipu_requests.session(
+        base_url="https://api-eu.mipuyun.com",
+        client_key="your_key",
+        client_secret="your_secret",
+        agent="JQ",
+    )
+    s.proxies = "res_mipu_bookxWdyg"
+
+    resp = s.get(url, headers={...}, params={...})
+    resp = s.post(url, data=form, headers={...})
+    resp.raise_for_status()
+    data = resp.json()
+"""
+
+from .session import session, Session
+from .response import Response
+from .exceptions import (
+    RequestException,
+    HTTPError,
+    APIError,
+    PollTimeoutError,
+)
+
+__version__ = "1.0.0"
+
+__all__ = [
+    "session",
+    "Session",
+    "Response",
+    "RequestException",
+    "HTTPError",
+    "APIError",
+    "PollTimeoutError",
+]