Added the registry functions

src/game_reasoning_arena/backends/__init__.py

@@ -0,0 +1,37 @@
+"""
+Backends package for LLM inference.
+
+This package provides different backends for LLM inference:
+- LiteLLM: API-based inference (OpenAI, Anthropic, etc.)
+- vLLM: Local GPU inference
+"""
+
+from .llm_registry import (
+    initialize_llm_registry,
+    LLM_REGISTRY,
+    generate_response,
+    get_available_models,
+    get_backend_for_model,
+    extract_model_name,
+    detect_model_backend,
+    list_models
+)
+from .litellm_backend import LiteLLMBackend
+from .vllm_backend import VLLMBackend
+from .huggingface_backend import HuggingFaceBackend
+from .base_backend import BaseLLMBackend
+
+__all__ = [
+    "initialize_llm_registry",
+    "LLM_REGISTRY",
+    "generate_response",
+    "get_available_models",
+    "get_backend_for_model",
+    "extract_model_name",
+    "detect_model_backend",
+    "list_models",
+    "LiteLLMBackend",
+    "VLLMBackend",
+    "HuggingFaceBackend",
+    "BaseLLMBackend"
+]