{mcp} Add MCP Proxy Server with OAuth Authentication

[AllyW]

Related command
aliyun mcp-proxy

Description
Adds a local proxy server for Aliyun API MCP Servers that handles OAuth authentication automatically, enabling MCP clients to connect without credential management.

Key Features

• OAuth Authentication: Automatically manages OAuth 2.0 authentication flow with PKCE
• Token Management: Implements automatic token refresh with proactive refresh windows
• Dual Authorization Modes: Supports both automatic browser-based authorization and manual code input mode for headless environments
• Request Proxying: Handles both HTTP and SSE (Server-Sent Events) requests, forwarding them to upstream MCP servers with proper authentication headers
• Health Monitoring: Provides /health endpoint with comprehensive status information including token validity, memory usage, and request statistics
• Graceful Shutdown: Implements proper signal handling and graceful server shutdown

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.86%. Comparing base (4348fa2) to head (3e78bab).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1279      +/-   ##
==========================================
+ Coverage   83.84%   83.86%   +0.01%     
==========================================
  Files          49       49              
  Lines        4698     4703       +5     
==========================================
+ Hits         3939     3944       +5     
  Misses        552      552              
  Partials      207      207              

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