Initial release of mcd-cn:

• Query McDonald's China MCP server for campaign calendars and coupon information via CLI.
• Human-readable output by default; supports JSON output for scripting.
• Features commands for viewing campaign calendars, available coupons, auto-claiming, and more.
• Requires MCP token (MCDCN_MCP_TOKEN) for authentication.
• Rate limited to 600 requests/minute per token.