fix(core): handle model errors and improve configuration

- Import ModelNotSupportedError for proper exception handling in model resolution
- Update login_url configuration to reference class URL attribute dynamically
- Remove redundant typing imports after internal module reorganization

g4f/Provider/CablyAI.py

@@ -1,11 +1,11 @@
 from __future__ import annotations
 
-from ..typing import AsyncResult, Messages
+from ..errors import ModelNotSupportedError
 from .template import OpenaiTemplate
 
 class CablyAI(OpenaiTemplate):
     url = "https://cablyai.com"
-    login_url = None
+    login_url = url
     api_base = "https://cablyai.com/v1"
     api_key = "sk-your-openai-api-key"