文档：MCP 使用文档新增环境变量配置说明

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• Upstream PR: [codex] fix mcp init timeout keyword mismatch AstrBot#5743
• Trigger: PR merged

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AI change summary:

• zh/use/mcp.md：新增「环境变量配置」章节，说明 MCP 初始化与启用超时的环境变量配置方法。
• en/use/mcp.md：同步新增「Environment Variables」章节，中英文档保持一致。

Please review manually before merging.

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