Fix: Search app AI summary ERROR And The tag set cannot be selected #9649 #9652 (#9664)

### What problem does this PR solve?
Fix: Search app AI summary ERROR And The tag set cannot be selected
#9649 #9652
- Search app AI summary ERROR: 'dict' object has no attribute 'split'
#9649
- fix The tag set cannot be selected in the knowledge base. #9652
- Added custom parameter options to the LlmSettingFieldItems component
- Adjusted the document preview height to improve page layout
adaptability

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/locales/zh-traditional.ts

@@ -454,6 +454,7 @@ export default {
       improvise: '即興創作',
       precise: '精確',
       balance: '平衡',
+      custom: '自定義',
       freedomTip: `“精確”意味著法學碩士會保守並謹慎地回答你的問題。“即興發揮”意味著你希望法學碩士能夠自由地暢所欲言。“平衡”是謹慎與自由之間的平衡。`,
       temperature: '溫度',
       temperatureMessage: '溫度是必填項',