feat: implement AI model API proxy service

backend/app/models/provider.py

@@ -0,0 +1,13 @@
+"""Provider model."""
+from dataclasses import dataclass
+from typing import Optional
+
+
+@dataclass
+class Provider:
+    """Model provider configuration."""
+    id: int
+    name: str
+    base_url: str
+    api_type: str
+    is_active: bool