Enhance knowledge base functionality and integrate S3 storage support

- Add new models for `KnowledgeDocument` and `KnowledgeChunk` to manage document ingestion and chunking.
- Implement S3-compatible storage integration for knowledge documents, allowing for file uploads and retrieval.
- Introduce API endpoints for managing knowledge bases and documents, including creation, deletion, and searching.
- Update frontend components to support knowledge base configuration and document management, improving user interaction.
- Enhance backend services for knowledge processing and retrieval, ensuring robust handling of document statuses and errors.

backend/app.py

@@ -17,6 +17,7 @@ from contextlib import asynccontextmanager
 import settings
 import uvicorn
 from db.session import sync_default_tools, sync_interface_definitions
+from services.knowledge import recover_interrupted_documents
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
@@ -38,6 +39,7 @@ from routes import (
 async def lifespan(_app: FastAPI):
     await sync_interface_definitions()
     await sync_default_tools()
+    await recover_interrupted_documents()
     yield