### What problem does this PR solve?


### Type of change

- [x] Performance Improvement

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

[#1987](https://github.com/infiniflow/ragflow/issues/1987)

When scanning PDF files character by character, the parser excluded
spaces if the string did not match regex. Text from [Russian
documents](https://github.com/user-attachments/files/16659706/dogovor_oferta.pdf)
needs spaces, but it does not match the regex because it uses different
alphabet. That's why PDFs were parsed incorrectly and were almost
unusable as source. Fixed that by adding Russian alphabet to regex.

There might be problems with other languages that use different
alphabets. I additionally tested [PDF in
Spanish](https://www.scusd.edu/sites/main/files/file-attachments/howtohelpyourchildsucceedinschoolspanish.pdf?1338307816)
and old [a-zA-Z...] regex parses it correctly with spaces.

### Type of change

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

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

#2415

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?

### Type of change

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

### What problem does this PR solve?

#2415

### Type of change

- [x] Performance Improvement

### What problem does this PR solve?



### Type of change

- [x] Documentation Update

### What problem does this PR solve?

feat: When the mindmap data is empty, it will not be displayed on the
search page #2247
### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Modify the style of the answer card on the search page #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Use Spin to wrap the chunk list on the search page #2247
### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

### What problem does this PR solve?

#2356

### Type of change

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

### What problem does this PR solve?

feat: Click on the chunk on the search page to locate the corresponding
file location #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Wrap the searched chunk with a Popover #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

#2379 

### Type of change

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

### What problem does this PR solve?

 feat: Add component AkShare #1739

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Add component WenCai #1739

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?
#2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Use Tree to display the knowledge base list on the search page
#2247
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

https://github.com/infiniflow/ragflow/issues/2356

### What problem does this PR solve?

As title

### Type of change

- [X] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

Add a default value for do_refer in Dialog

### Type of change

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

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

### What problem does this PR solve?

feat: Cover the entire search page with a background image #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

feat: Catching errors with IndentedTree #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?
 #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Retrieval chunks by page #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?


### Type of change

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

### What problem does this PR solve?

feat: Catch errors in getting mindmap #2247

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Proxy the api address to the local nginx address #2350

### Type of change

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

### What problem does this PR solve?

#2359  fix OpenRouter add bug and the way to add OpenRouter model

### Type of change

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

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

### What problem does this PR solve?


### Type of change

- [x] Refactoring

### What problem does this PR solve?

#2335  fix SILICONFLOW embedding error

### Type of change

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

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>

### What problem does this PR solve?

Includes SDK for creating, updating sessions, getting sessions, listing
sessions, and dialogues
#1102 
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

### What problem does this PR solve?
the setting was kept empty for Empty_response. In expectation, this case
should get a response from the LLM if can't find the references from the
knowledgebase.

### Type of change

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


![image](https://github.com/user-attachments/assets/9c382b1d-40f6-43b0-848c-fa6863f9a253)

![image](https://github.com/user-attachments/assets/032d2001-97a2-4faa-91bf-c9c57caf2070)

Co-authored-by: Theta Wang (ncu) <chunshan.connect@gmail.com>

### What problem does this PR solve?
fix: 123.60.95.134 redirect attack #2350


### Type of change

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

### What problem does this PR solve?


### Type of change

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

### What problem does this PR solve?

fix: Make markdown support line breaks #2315

### Type of change

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

### What problem does this PR solve?


### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

feat: Dynamically change the background image on the search homepage
every day #2247

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

### What problem does this PR solve?



### Type of change


- [x] Documentation Update

### What problem does this PR solve?



### Type of change

- [x] Documentation Update

### What problem does this PR solve?
feat: Add RetrievalDocuments to SearchPage #2247
feat: Click on the link in the reference to display the pdf drawer #2247

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

SDK for session
#1102 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Feiue <10215101452@stu.ecun.edu.cn>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

### What problem does this PR solve?

feat: The search box is displayed globally when the page is loaded for
the first time #2247

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

### What problem does this PR solve?

### Type of change

- [x] Documentation Update