docs(karpor): add DeepSeek AI backend option to installation guide

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1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y

2. What is the scope of this PR (e.g. component or file name):

3. Provide a description of the PR(e.g. more details, effects, motivations or doc link):

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
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4. Are there any breaking changes?(Y/N) and describe the breaking changes(e.g. more details, motivations or doc link):

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• Y

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Name	Status	Preview	Comments	Updated (UTC)
kusionstack	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 16, 2025 0:02am