Move some constants to common (#11004)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

api/db/init_data.py

@@ -20,7 +20,7 @@ import time
 import uuid
 from copy import deepcopy
 
-from api.db import LLMType, UserTenantRole
+from api.db import UserTenantRole
 from api.db.db_models import init_database_tables as init_web_db, LLMFactories, LLM, TenantLLM
 from api.db.services import UserService
 from api.db.services.canvas_service import CanvasTemplateService
@@ -30,6 +30,7 @@ from api.db.services.tenant_llm_service import LLMFactoriesService, TenantLLMSer
 from api.db.services.llm_service import LLMService, LLMBundle, get_init_tenant_llm
 from api.db.services.user_service import TenantService, UserTenantService
 from api import settings
+from common.constants import LLMType
 from common.file_utils import get_project_base_directory
 from api.common.base64 import encode_to_base64