📝 docs: Add docs for env LLM_VISION_IMAGE_USE_BASE64

[CaiJingLong]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

lobe-chat/src/libs/agent-runtime/utils/openaiHelpers.ts

Lines 13 to 20 in 74fd0dc

	if (type === 'url' && process.env.LLM_VISION_IMAGE_USE_BASE64 === '1') {
	const { base64, mimeType } = await imageUrlToBase64(content.image_url.url);
	return {
	...content,
	image_url: { ...content.image_url, url: `data:${mimeType};base64,${base64}` },
	};
	}

📝 补充信息 | Additional Information

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.97%. Comparing base (aab0c53) to head (8a332ad).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #4977    +/-   ##
========================================
  Coverage   91.97%   91.97%            
========================================
  Files         548      548            
  Lines       41357    41357            
  Branches     3706     3550   -156     
========================================
  Hits        38038    38038            
  Misses       3319     3319            

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[arvinxx]

这个变量建议放到 S3 下面哈，因为一般只有配置 S3 的时候才需要配这个

[CaiJingLong]

我是在 docker 部署的时候用到的，OK，我会移动到 S3 下