AI implementation for openai and claude.

backend/app/services/provider_base.py

@@ -0,0 +1,27 @@
+from abc import ABC, abstractmethod
+from typing import AsyncGenerator
+
+
+class AIProvider(ABC):
+    """Abstract base class for AI providers"""
+
+    def __init__(self, api_key: str, model: str):
+        self.api_key = api_key
+        self.model = model
+
+    @abstractmethod
+    async def chat(self, message: str, system_prompt: str = None) -> str:
+        """Non-streaming chat"""
+        pass
+
+    @abstractmethod
+    async def chat_stream(
+        self, message: str, system_prompt: str = None
+    ) -> AsyncGenerator[str, None]:
+        """Streaming chat - yields chunks of text"""
+        pass
+
+    @abstractmethod
+    def get_provider_name(self) -> str:
+        """Return provider identifier"""
+        pass