feat(core,backends,frontends,storage): conversations, inject queue, session pool, gateway mcp tools, api frontend

tests/test_claude_sdk_backend.py

@@ -93,6 +93,9 @@ class FakeClient:
     async def query(self, prompt: str) -> None:
         self.prompts.append(prompt)
 
+    async def interrupt(self) -> None:
+        self.interrupted = True
+
     async def receive_response(self):
         start = {"type": "message_start", "message": {}}
         yield StreamEvent(uuid="u", session_id="s", event=start)