feat: update Novita AI models and docs

[jasonhp]

💻 变更类型 | Change Type

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

🔀 变更说明 | Description of Change

1. Add DeepSeek models for Novita AI
2. Add pricing for Novita AI models
3. Update Novita AI usage docs

📝 补充信息 | Additional Information

New Novita AI icons in lobehub/lobe-icons#62.

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👍 @jasonhp

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.01%. Comparing base (63c571b) to head (9c41529).
Report is 22 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5608      +/-   ##
==========================================
+ Coverage   92.14%   98.01%   +5.86%     
==========================================
  Files         644       14     -630     
  Lines       57371     3622   -53749     
  Branches     4261      402    -3859     
==========================================
- Hits        52865     3550   -49315     
+ Misses       4506       72    -4434     

Flag	Coverage Δ
app	?
server	98.01% <ø> (ø)

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