Remove 'get_lan_ip' and add common misc_utils.py (#10880)

### What problem does this PR solve?

Add get_uuid, download_img and hash_str2int into misc_utils.py

### Type of change

- [x] Refactoring

---------

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

api/db/services/canvas_service.py

@@ -22,7 +22,7 @@ from api.db import CanvasCategory, TenantPermission
 from api.db.db_models import DB, CanvasTemplate, User, UserCanvas, API4Conversation
 from api.db.services.api_service import API4ConversationService
 from api.db.services.common_service import CommonService
-from api.utils import get_uuid
+from common.misc_utils import get_uuid
 from api.utils.api_utils import get_data_openai
 import tiktoken
 from peewee import fn