Step 2: Remove MODEL_CONFIG and update get_model_config() to use IntegrationSettings only

- Remove MODEL_CONFIG dict with hardcoded defaults
- Update get_model_config() to require account parameter
- Remove default_config fallback
- Remove unused helper functions (get_model, get_max_tokens, get_temperature)
- Fix generate_images.py to pass account to get_model_config()
- Raise ValueError with clear messages when IntegrationSettings not configured

backend/igny8_core/ai/functions/generate_images.py

@@ -122,8 +122,10 @@ class GenerateImagesFunction(BaseAIFunction):
             }
         )
         
-        # Get model config
-        model_config = get_model_config('extract_image_prompts')
+        # Get model config (requires account)
+        if not account_obj:
+            raise ValueError("Account is required for model configuration")
+        model_config = get_model_config('extract_image_prompts', account=account_obj)
         
         # Call AI to extract prompts using centralized request handler
         result = ai_core.run_ai_request(