Add backend api and engine

engine/core/__init__.py

@@ -0,0 +1,20 @@
+"""Core Components Package"""
+
+from core.events import EventBus, get_event_bus
+from core.transports import BaseTransport, SocketTransport, WebRtcTransport
+from core.session import Session
+from core.conversation import ConversationManager, ConversationState, ConversationTurn
+from core.duplex_pipeline import DuplexPipeline
+
+__all__ = [
+    "EventBus",
+    "get_event_bus",
+    "BaseTransport",
+    "SocketTransport",
+    "WebRtcTransport",
+    "Session",
+    "ConversationManager",
+    "ConversationState",
+    "ConversationTurn",
+    "DuplexPipeline",
+]