🛂(frontend) use max size and extension from config

The max size and allowed extensions for document
import are now fetched from the application
configuration.
This ensures consistency across the app and
allows for easier updates to these
settings in the future.

src/backend/core/api/viewsets.py

@@ -2340,6 +2340,8 @@ class ConfigView(drf.views.APIView):
             "AI_FEATURE_ENABLED",
             "COLLABORATION_WS_URL",
             "COLLABORATION_WS_NOT_CONNECTED_READY_ONLY",
+            "CONVERSION_FILE_EXTENSIONS_ALLOWED",
+            "CONVERSION_FILE_MAX_SIZE",
             "CRISP_WEBSITE_ID",
             "ENVIRONMENT",
             "FRONTEND_CSS_URL",