feat: added langflow, langfuse and langgraph integrations (#17)

Co-authored-by: Sharang Parnerkar <parnerkarsharang@gmail.com>
Reviewed-on: #17

src/infrastructure/mod.rs

@@ -2,6 +2,7 @@
 // the #[server] macro generates client stubs for the web target)
 pub mod auth_check;
 pub mod chat;
+pub mod langgraph;
 pub mod llm;
 pub mod ollama;
 pub mod searxng;