feat: added file handling for daytona sandboxes

- Added _TimeoutAwareSandbox class to handle per-command timeouts in DaytonaSandbox.
- Updated _find_or_create function to manage sandbox states and restart stopped/archived sandboxes.
- Enhanced get_or_create_sandbox to return the new sandbox class.
- Introduced file download functionality in the frontend, allowing users to download generated files from the sandbox.
- Updated system prompt to include guidelines for sharing generated files.

surfsense_backend/app/routes/__init__.py

@@ -36,6 +36,7 @@ from .podcasts_routes import router as podcasts_router
 from .public_chat_routes import router as public_chat_router
 from .rbac_routes import router as rbac_router
 from .reports_routes import router as reports_router
+from .sandbox_routes import router as sandbox_router
 from .search_source_connectors_routes import router as search_source_connectors_router
 from .search_spaces_routes import router as search_spaces_router
 from .slack_add_connector_route import router as slack_add_connector_router
@@ -50,6 +51,7 @@ router.include_router(editor_router)
 router.include_router(documents_router)
 router.include_router(notes_router)
 router.include_router(new_chat_router)  # Chat with assistant-ui persistence
+router.include_router(sandbox_router)  # Sandbox file downloads (Daytona)
 router.include_router(chat_comments_router)
 router.include_router(podcasts_router)  # Podcast task status and audio
 router.include_router(reports_router)  # Report CRUD and export (PDF/DOCX)