Fix: update docs generator (#14070)

### What problem does this PR solve?

Refactor: update docs generator

### Type of change

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

1. Support multiple document generator components and correctly display
messages in the message component. The document generator will not
overwrite other messages.

<img width="700" alt="Screenshot from 2026-04-13 13-56-17"
src="https://github.com/user-attachments/assets/3f3e06e8-33ce-4df1-8b05-510c86af70a4"
/>

2. Support Chinese content and ensure correct Markdown rendering in PDF
and DOCX
<img width="700" alt="image"
src="https://github.com/user-attachments/assets/69bf1f7b-261d-48e5-a9f3-8e94462b90ed"
/>

3. Simplify configuration page and support more output format
 
<img height="700" alt="image"
src="https://github.com/user-attachments/assets/8647374c-c055-4daa-ad71-cd9052eb138e"
/>

4. Hide download from other components except for message 
<img width="700" alt="image"
src="https://github.com/user-attachments/assets/a723dfcb-b60d-4eb5-b2f6-d41ca5955eb4"
/>

<img width="700" alt="image"
src="https://github.com/user-attachments/assets/a8762ac4-807b-4f0b-9287-65f82f7c9c98"
/>

5. Sanitize filename
 
<img width="700" alt="image"
src="https://github.com/user-attachments/assets/df49509f-37c0-40f9-b03d-bd6ce7fdefa8"
/>


6. And more changes on usability

web/src/interfaces/database/chat.ts

@@ -1,6 +1,13 @@
 import { MessageType } from '@/constants/chat';
 import { IAttachment } from '@/hooks/use-send-message';
 
+export interface IDocumentDownloadInfo {
+  doc_id: string;
+  filename: string;
+  mime_type: string;
+  size?: number;
+}
+
 export interface PromptConfig {
   empty_response: string;
   parameters: Parameter[];
@@ -104,6 +111,7 @@ export interface Message {
   files?: (File | UploadResponseDataType)[];
   chatBoxId?: string;
   attachment?: IAttachment;
+  downloads?: IDocumentDownloadInfo[];
 }
 
 export interface IReferenceChunk {
@@ -134,6 +142,7 @@ export interface IReferenceObject {
 export interface IAnswer {
   answer: string;
   attachment?: IAttachment;
+  downloads?: IDocumentDownloadInfo[];
   reference?: IReference;
   conversationId?: string;
   prompt?: string;