✨feat: add epub file chunk split support

[stevendong]

💻 变更类型 | Change Type

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

🔀 变更说明 | Description of Change

知识库支持对epub文件的分块

📝 补充信息 | Additional Information

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👍 @stevendong

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Name	Status	Preview	Updated (UTC)
lobe-chat-database	✅ Ready (Inspect)	Visit Preview	Mar 3, 2025 2:51am

[codecov]

Codecov Report

Attention: Patch coverage is 90.10989% with 9 lines in your changes missing coverage. Please review.

Project coverage is 91.47%. Comparing base (15d8a35) to head (17026a7).

Files with missing lines	Patch %	Lines
src/server/utils/tempFileManager.ts	88.57%	8 Missing ⚠️
src/libs/langchain/loaders/epub/index.ts	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6317      +/-   ##
==========================================
- Coverage   91.47%   91.47%   -0.01%     
==========================================
  Files         713      715       +2     
  Lines       66560    66651      +91     
  Branches     3225     4502    +1277     
==========================================
+ Hits        60889    60971      +82     
- Misses       5671     5680       +9     

Flag	Coverage Δ
app	91.47% <90.10%> (-0.01%)	⬇️
server	97.57% <ø> (ø)

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