♻️ refactor: refactor *_PROXY_URL, get var from ENV

[hezhijie0327]

💻 变更类型 | Change Type

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

🔀 变更说明 | Description of Change

1. 重构 *_PROXY_URL，直接从环境变量（process.env.*_PROXY_URL）中获取

文件	更改详情
src/config/llm.ts	移除所有 *_PROXY_URL
src/server/modules/AgentRuntime/index.ts	直接从环境变量中获取
src/server/globalConfig/index.ts	移除 getLLMConfig()，直接从环境变量中获取 process.env.OLLAMA_PROXY_URL
src/app/(backend)/_deprecated/createBizOpenAI/createAzureOpenai.ts
src/app/(backend)/_deprecated/createBizOpenAI/createOpenai.ts	直接从环境变量中获取 process.env.OPENAI_PROXY_URL

2. 增加 XAI_PROXY_URL
3. 补齐 MOONSHOT_PROXY_URL 配置，在 src/config/modelProviders/moonshot.ts 中缺少 proxyUrl 字段

Before	After

• fix [Bug] I guess XAI_PROXY_URL is not working #4777

📝 补充信息 | Additional Information

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[codecov]

Codecov Report

Attention: Patch coverage is 82.85714% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.31%. Comparing base (3f8d3db) to head (15ea887).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/server/modules/AgentRuntime/index.ts	80.64%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4747      +/-   ##
==========================================
- Coverage   92.32%   92.31%   -0.01%     
==========================================
  Files         528      528              
  Lines       37020    37002      -18     
  Branches     3690     2370    -1320     
==========================================
- Hits        34179    34160      -19     
- Misses       2841     2842       +1     

Flag	Coverage Δ
app	92.31% <82.85%> (-0.01%)	⬇️
server	96.17% <ø> (ø)

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[arvinxx]

棒 👍 感觉下一步就可以简化 AgentRuntime 的传参了

[lobehubbot]

❤️ Great PR @hezhijie0327 ❤️

The growth of project is inseparable from user feedback and contribution, thanks for your contribution! If you are interesting with the lobehub developer community, please join our discord and then dm @arvinxx or @canisminor1990. They will invite you to our private developer channel. We are talking about the lobe-chat development or sharing ai newsletter around the world.
项目的成长离不开用户反馈和贡献，感谢您的贡献! 如果您对 LobeHub 开发者社区感兴趣，请加入我们的 discord，然后私信 @arvinxx 或 @canisminor1990。他们会邀请您加入我们的私密开发者频道。我们将会讨论关于 Lobe Chat 的开发，分享和讨论全球范围内的 AI 消息。

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🎉 This PR is included in version 1.32.8 🎉

The release is available on:

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• GitHub release

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