Refa: split services about llm. (#9450)

### What problem does this PR solve?

### Type of change

- [x] Refactoring

api/apps/sdk/chat.py

@@ -21,7 +21,7 @@ from api import settings
 from api.db import StatusEnum
 from api.db.services.dialog_service import DialogService
 from api.db.services.knowledgebase_service import KnowledgebaseService
-from api.db.services.llm_service import TenantLLMService
+from api.db.services.tenant_llm_service import TenantLLMService
 from api.db.services.user_service import TenantService
 from api.utils import get_uuid
 from api.utils.api_utils import check_duplicate_ids, get_error_data_result, get_result, token_required

api/apps/sdk/doc.py

@@ -32,7 +32,8 @@ from api.db.services.document_service import DocumentService
 from api.db.services.file2document_service import File2DocumentService
 from api.db.services.file_service import FileService
 from api.db.services.knowledgebase_service import KnowledgebaseService
-from api.db.services.llm_service import LLMBundle, TenantLLMService
+from api.db.services.llm_service import LLMBundle
+from api.db.services.tenant_llm_service import TenantLLMService
 from api.db.services.task_service import TaskService, queue_tasks
 from api.utils.api_utils import check_duplicate_ids, construct_json_result, get_error_data_result, get_parser_config, get_result, server_error_response, token_required
 from rag.app.qa import beAdoc, rmPrefix

api/apps/sdk/session.py

@@ -16,20 +16,17 @@
 import json
 import re
 import time
-
 import tiktoken
 from flask import Response, jsonify, request
-
 from agent.canvas import Canvas
 from api.db import LLMType, StatusEnum
-from api.db.db_models import API4Conversation, APIToken
+from api.db.db_models import APIToken
 from api.db.services.api_service import API4ConversationService
 from api.db.services.canvas_service import UserCanvasService, completionOpenAI
 from api.db.services.canvas_service import completion as agent_completion
 from api.db.services.conversation_service import ConversationService, iframe_completion
 from api.db.services.conversation_service import completion as rag_completion
 from api.db.services.dialog_service import DialogService, ask, chat
-from api.db.services.file_service import FileService
 from api.db.services.knowledgebase_service import KnowledgebaseService
 from api.db.services.llm_service import LLMBundle
 from api.utils import get_uuid