feat: Adds document intelligence model configuration (#19692)

* Adds document intelligence model configuration

Enables the configuration of the Document Intelligence model to be used by the RAG pipeline.

This allows users to specify the model they want to use for document processing, providing flexibility and control over the extraction process.

* Added Titel to Document Intelligence Model Config

Added Titel to Document Intelligence Model Config

backend/open_webui/retrieval/loaders/main.py

@@ -322,12 +322,14 @@ class Loader:
                     file_path=file_path,
                     api_endpoint=self.kwargs.get("DOCUMENT_INTELLIGENCE_ENDPOINT"),
                     api_key=self.kwargs.get("DOCUMENT_INTELLIGENCE_KEY"),
+                    api_model=self.kwargs.get("DOCUMENT_INTELLIGENCE_MODEL"),
                 )
             else:
                 loader = AzureAIDocumentIntelligenceLoader(
                     file_path=file_path,
                     api_endpoint=self.kwargs.get("DOCUMENT_INTELLIGENCE_ENDPOINT"),
                     azure_credential=DefaultAzureCredential(),
+                    api_model=self.kwargs.get("DOCUMENT_INTELLIGENCE_MODEL"),
                 )
         elif self.engine == "mineru" and file_ext in [
             "pdf"