Differentiate custom from openrouter models

Split readme into multiple docs

providers/openai_compatible.py

@@ -75,11 +75,11 @@ class OpenAICompatibleProvider(ModelProvider):
                 logging.info(f"Configured allowed models for {self.FRIENDLY_NAME}: {sorted(models)}")
                 return models
 
-        # Log warning if no allow-list configured for proxy providers
+        # Log info if no allow-list configured for proxy providers
         if self.get_provider_type() not in [ProviderType.GOOGLE, ProviderType.OPENAI]:
-            logging.warning(
-                f"No model allow-list configured for {self.FRIENDLY_NAME}. "
-                f"Set {env_var} to restrict model access and control costs."
+            logging.info(
+                f"Model allow-list not configured for {self.FRIENDLY_NAME} - all models permitted. "
+                f"To restrict access, set {env_var} with comma-separated model names."
             )
 
         return None