build(uv): add mcp python client

Author: NicholasGoh

backend/pyproject.toml

@@ -14,6 +14,7 @@ dependencies = [
     "langchain-postgres==0.0.12",
     "langfuse==2.60.2",
     "langgraph==0.2.39",
+    "mcp[cli]>=1.6.0",
     "prometheus-client==0.21.1",
     "psycopg[binary]==3.2.3",
     "pydantic-settings==2.6.0",