feat: 增加了DeepSeek大模型支持 && fix: 修复了系统设置->模型设置中的动态表单复用时，错误地显示之前动态表单内容的bug && perf: 修改Azure OpenAI模型表单描述，简化对应代码实现

[YoungZM339]

What this PR does / why we need it?

Summary of your change

feat: 增加了DeepSeek大模型支持

fix: 修复了系统设置->模型设置中的动态表单复用时，错误地显示之前动态表单内容的bug
#378

perf: 修改Azure OpenAI模型表单描述，简化代码实现（取消对AzureLLMModelCredential的依赖，保留DefaultAzureLLMModelCredential）

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[maninhill]

感谢支持。