Restructure foe 2 main providers and tools conversion

src/airflow_wingman/providers/__init__.py

@@ -0,0 +1,41 @@
+"""
+Provider factory for Airflow Wingman.
+
+This module contains the factory function to create provider instances
+based on the provider name.
+"""
+
+from airflow_wingman.providers.anthropic_provider import AnthropicProvider
+from airflow_wingman.providers.base import BaseLLMProvider
+from airflow_wingman.providers.openai_provider import OpenAIProvider
+
+
+def create_llm_provider(provider_name: str, api_key: str, base_url: str | None = None) -> BaseLLMProvider:
+    """
+    Create a provider instance based on the provider name.
+
+    Args:
+        provider_name: Name of the provider (openai, anthropic, openrouter)
+        api_key: API key for the provider
+        base_url: Optional base URL for the provider API
+
+    Returns:
+        Provider instance
+
+    Raises:
+        ValueError: If the provider is not supported
+    """
+    provider_name = provider_name.lower()
+
+    if provider_name == "openai":
+        return OpenAIProvider(api_key=api_key, base_url=base_url)
+    elif provider_name == "openrouter":
+        # OpenRouter uses the OpenAI API format, so we can use the OpenAI provider
+        # with a custom base URL
+        if not base_url:
+            base_url = "https://openrouter.ai/api/v1"
+        return OpenAIProvider(api_key=api_key, base_url=base_url)
+    elif provider_name == "anthropic":
+        return AnthropicProvider(api_key=api_key)
+    else:
+        raise ValueError(f"Unsupported provider: {provider_name}. Supported providers: openai, anthropic, openrouter")