feat: add Nailong Fund advisor capabilities

app/api/controllers/conversations.py

@@ -3,21 +3,28 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.api.dependencies.auth import build_request_context
 from app.api.dependencies.database import get_session
+from app.api.dependencies.rate_limit import enforce_rate_limit
 from app.api.schemas.conversations import FeedbackRequest, HandoverRequest
 from app.core.contracts import RequestContext
+from app.core.cursor import parse_cursor
 from app.service.conversation_service import ConversationService
 
-router = APIRouter(prefix="/api/v1", tags=["conversations"])
+router = APIRouter(
+    prefix="/api/v1", tags=["conversations"], dependencies=[Depends(enforce_rate_limit)]
+)
 
 
 @router.get("/conversations/{session_id}/messages")
 async def list_messages(
     session_id: str,
     limit: int = Query(default=20, ge=1, le=100),
+    cursor: str | None = Query(default=None),
     context: RequestContext = Depends(build_request_context),  # noqa: B008
     session: AsyncSession = Depends(get_session),  # noqa: B008
 ) -> dict[str, object]:
-    return await ConversationService(session).messages(session_id, context, limit)
+    return await ConversationService(session).messages(
+        session_id, context, limit, before=parse_cursor(cursor)
+    )
 
 
 @router.post("/conversation-messages/{message_id}/feedback", status_code=status.HTTP_201_CREATED)