Remove Langfuse card (service removed)

portal/tools.py

@@ -81,8 +81,6 @@ def _cat() -> list[Tool]:
              "OmniRoute LLM gateway dashboard", "https://omniroute.lab.audasmedia.com.au"),
         Tool("n8n", "n8n", "ai",
              "Workflow automation", "https://n8n.lab.audasmedia.com.au", login=True),
-        Tool("langfuse", "Langfuse", "ai",
-             "LLM tracing & observability", "https://langfuse.home.lab", login=True, lan=True, admin=True),
         Tool("prefect", "Prefect", "ai",
              "Workflow orchestration", "https://prefect.lab.audasmedia.com.au", login=True),
         Tool("archon", "Archon", "ai",