### What problem does this PR solve?
Fix: Linter error message: Use 'const' instead.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Updated variable declarations across form components, agent utilities,
memory management hooks, and data handling functions to enhance code
consistency and maintainability throughout the application codebase.
* **Style**
* Added ESLint suppressions to document intentional constant-condition
patterns in asynchronous event streaming operations.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
### What problem does this PR solve?
api_host -> webAPI
ExternalApi -> restAPIv1
### Type of change
- [x] Refactoring
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Refactor**
* Updated internal API endpoint configuration to use consolidated base
URL constants for improved maintainability and consistency across the
application.
* **Chores**
* Updated server-side protocol validation for admin connectivity checks.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### 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] Refactoring
### What problem does this PR solve?
Fix: Bugs fixed (#13109)
- chat pdf preview error
- data source add box error
- change route next-chat -> chat , next-search->search ...
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Fix: Add authentication validation to the document API interface for
embedded pages and modify the document display styles.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Previously, we added support for previewing PPT and PPTX files in the
backend. Now, we are adding it to the frontend, so when the slides in
the chat interface are referenced, they will no longer be blank.
### Type of change
- Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Fix: Some bugs
- In a production environment, a second-level page refresh results in a
white screen.
- The knowledge graph cannot be opened.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
### What problem does this PR solve?
Refactor: UmiJs -> Vite+React
### Type of change
- [x] Refactoring
---------
Co-authored-by: Liu An <asiro@qq.com>
## What problem does this PR solve?
Feat: detect docx support via header-byte inspection, a further optimize
based on #11684
Not all files with a .doc extension are truly legacy .doc formats, and
some are internally valid .docx documents.
The previous implementation relied on URL suffix checks, which
misclassified these cases and was therefore not reliable.
Doc file could be previewed:
[en2zh.doc](https://github.com/user-attachments/files/23921131/en2zh.doc)
Doc file could not be previewed:
[file-sample_100kB.doc](https://github.com/user-attachments/files/23921134/file-sample_100kB.doc)
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
