feat!: breaking change - OpenRouter models are now read from conf/openrouter_models.json while Custom / Self-hosted models are read from conf/custom_models.json

feat: Azure OpenAI / Azure AI Foundry support. Models should be defined in conf/azure_models.json (or a custom path). See .env.example for environment variables or see readme. https://github.com/BeehiveInnovations/zen-mcp-server/issues/265

feat: OpenRouter / Custom Models / Azure can separately also use custom config paths now (see .env.example )

refactor: Model registry class made abstract, OpenRouter / Custom Provider / Azure OpenAI now subclass these

refactor: breaking change: `is_custom` property has been removed from model_capabilities.py (and thus custom_models.json) given each models are now read from separate configuration files

tests/test_custom_openai_temperature_fix.py

@@ -34,8 +34,7 @@ class TestCustomOpenAITemperatureParameterFix:
         config_models = [
             {
                 "model_name": "gpt-5-2025-08-07",
-                "provider": "ProviderType.OPENAI",
-                "is_custom": True,
+                "provider": "openai",
                 "context_window": 400000,
                 "max_output_tokens": 128000,
                 "supports_extended_thinking": True,